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Publications by Svein Friis

149 publications found

Original articles

Ingeborgrud CB, Oerbeck B, Friis S, Pripp AH, Zeiner P, Aase H, Biele G, Dalsgaard S, Overgaard KR (2024)
Do maternal anxiety and depressive symptoms predict anxiety in children with and without ADHD at 8 years?
Eur Child Adolesc Psychiatry (in press)
DOI 10.1007/s00787-024-02374-1, PubMed 38376613

Ingeborgrud CB, Oerbeck B, Friis S, Zeiner P, Pripp AH, Aase H, Biele G, Dalsgaard S, Overgaard KR (2023)
Anxiety and depression from age 3 to 8 years in children with and without ADHD symptoms
Sci Rep, 13 (1), 15376
DOI 10.1038/s41598-023-42412-7, PubMed 37717097

Overgaard KR, Oerbeck B, Friis S, Pripp AH, Aase H, Biele G, Ingeborgrud CB, Polanczyk GV, Zeiner P (2023)
Early and repeated screening detects children with persistent attention-deficit/hyperactivity disorder
Eur Child Adolesc Psychiatry (in press)
DOI 10.1007/s00787-023-02284-8, PubMed 37624573

Gohar SM, Hegelstad WTV, Auestad B, Haahr UH, Joa I, Johannessen JO, Larsen TK, Opjordsmoen S, Rund BR, Røssberg JI, Simonsen E, Friis S, Melle I (2023)
Association between early suicidal trajectories in first-episode psychosis and 10-year follow-up: TIPS registry-linked study
Lancet Psychiatry, 10 (7), 528-536
DOI 10.1016/S2215-0366(23)00156-6, PubMed 37353264

Overgaard KR, Oerbeck B, Friis S, Pripp AH, Aase H, Biele G, Ingeborgrud CB, Polanczyk GV, Zeiner P (2022)
Attention-deficit/hyperactivity disorder from preschool to school age: change and stability of parent and teacher reports
Eur Child Adolesc Psychiatry, 32 (10), 1947-1955
DOI 10.1007/s00787-022-02019-1, PubMed 35737107

Biele G, Lekhal R, Overgaard KR, Vaage Wang M, Eek Brandlistuen R, Friis S, Zeiner P (2022)
The effect of special educational assistance in early childhood education and care on psycho-social difficulties in elementary school children
Child Adolesc Psychiatry Ment Health, 16 (1), 14
DOI 10.1186/s13034-022-00442-5, PubMed 35209931

Biele G, Overgaard KR, Friis S, Zeiner P, Aase H (2022)
Cognitive, emotional, and social functioning of preschoolers with attention deficit hyperactivity problems
BMC Psychiatry, 22 (1), 78
DOI 10.1186/s12888-021-03638-9, PubMed 35105343

Ottesen A, T V Hegelstad W, Joa I, Opjordsmoen SE, Rund BR, Røssberg JI, Simonsen E, Johannessen JO, Larsen TK, Haahr UH, McGlashan TH, Friis S, Melle I (2021)
Childhood trauma, antipsychotic medication, and symptom remission in first-episode psychosis
Psychol Med, 53 (6), 2399-2408
DOI 10.1017/S003329172100427X, PubMed 37144963

Vaskinn A, Sundet K, Melle I, Andreassen OA, Friis S (2021)
The factor structure of social cognition in schizophrenia: Weak evidence for separable domains
Schizophr Res Cogn, 26, 100208
DOI 10.1016/j.scog.2021.100208, PubMed 34430229

Overgaard KR, Oerbeck B, Wagner K, Friis S, Øhre B, Zeiner P (2021)
Youth with hearing loss: Emotional and behavioral problems and quality of life
Int J Pediatr Otorhinolaryngol, 145, 110718
DOI 10.1016/j.ijporl.2021.110718, PubMed 33887550

Overgaard KR, Oerbeck B, Friis S, Pripp AH, Aase H, Zeiner P (2021)
Predictive validity of attention-deficit/hyperactivity disorder from ages 3 to 5 Years
Eur Child Adolesc Psychiatry, 31 (7), 1-10
DOI 10.1007/s00787-021-01750-5, PubMed 33677627

Wedervang-Resell K, Ueland T, Aukrust P, Friis S, Holven KB, H Johannessen C, Lekva T, Lonning V, Smelror RE, Szabo A, Andreassen OA, Myhre AM, Agartz I (2020)
Reduced levels of circulating adhesion molecules in adolescents with early-onset psychosis
NPJ Schizophr, 6 (1), 20
DOI 10.1038/s41537-020-00112-5, PubMed 32811840

Wedervang-Resell K, Friis S, Lonning V, Smelror RE, Johannessen C, Agartz I, Ulven SM, Holven KB, Andreassen OA, Myhre AM (2019)
Lipid alterations in adolescents with early-onset psychosis may be independent of antipsychotic medication
Schizophr Res, 216, 295-301
DOI 10.1016/j.schres.2019.11.039, PubMed 31791814

Wedervang-Resell K, Friis S, Lonning V, Smelror RE, Johannessen C, Reponen EJ, Lyngstad SH, Lekva T, Aukrust P, Ueland T, Andreassen OA, Agartz I, Myhre AM (2019)
Increased interleukin 18 activity in adolescents with early-onset psychosis is associated with cortisol and depressive symptoms
Psychoneuroendocrinology, 112, 104513
DOI 10.1016/j.psyneuen.2019.104513, PubMed 31761332

Weibell MA, Johannessen JO, Auestad B, Bramness J, Brønnick K, Haahr U, Joa I, Larsen TK, Melle I, Opjordsmoen S, Rund BR, Røssberg JI, Simonsen E, Vaglum P, Stain H, Friis S, Hegelstad WTV (2019)
Early Substance Use Cessation Improves Cognition-10 Years Outcome in First-Episode Psychosis Patients
Front Psychiatry, 10, 495
DOI 10.3389/fpsyt.2019.00495, PubMed 31354551

Ferrara M, Guloksuz S, Li F, Burke S, Tek C, Friis S, Ten Velden Hegelstad W, Joa I, Johannessen JO, Melle I, Simonsen E, Srihari VH (2019)
Parsing the impact of early detection on duration of untreated psychosis (DUP): Applying quantile regression to data from the Scandinavian TIPS study
Schizophr Res, 210, 128-134
DOI 10.1016/j.schres.2019.05.035, PubMed 31204063

Overgaard KR, Oerbeck B, Friis S, Biele G, Pripp AH, Aase H, Zeiner P (2019)
Screening with an ADHD-specific rating scale in preschoolers: A cross-cultural comparison of the Early Childhood Inventory-4
Psychol Assess, 31 (8), 985-994
DOI 10.1037/pas0000722, PubMed 30958025

Overgaard KR, Madsen KB, Oerbeck B, Friis S, Obel C (2018)
The predictive validity of the Strengths and Difficulties Questionnaire for child attention-deficit/hyperactivity disorder
Eur Child Adolesc Psychiatry, 28 (5), 625-633
DOI 10.1007/s00787-018-1226-9, PubMed 30220077

Gardsjord ES, Romm KL, Røssberg JI, Friis S, Barder HE, Evensen J, Haahr U, Ten Velden Hegelstad W, Joa I, Johannessen JO, Langeveld J, Larsen TK, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, Melle I (2018)
Depression and functioning are important to subjective quality of life after a first episode psychosis
Compr Psychiatry, 86, 107-114
DOI 10.1016/j.comppsych.2018.07.014, PubMed 30114656

Moore JL, Friis S, Graham ID, Gundersen ET, Nordvik JE (2018)
Reported use of evidence in clinical practice: a survey of rehabilitation practices in Norway
BMC Health Serv Res, 18 (1), 379
DOI 10.1186/s12913-018-3193-8, PubMed 29801505

Øvergaard KR, Oerbeck B, Friis S, Pripp AH, Biele G, Aase H, Zeiner P (2018)
Attention-Deficit/Hyperactivity Disorder in Preschoolers: The Accuracy of a Short Screener
J Am Acad Child Adolesc Psychiatry, 57 (6), 428-435
DOI 10.1016/j.jaac.2018.03.008, PubMed 29859558

Langeveld J, Bjørkly S, Evensen J, Joa I, Johannessen JO, Larsen TK, Melle I, Opjordsmoen S, Røssberg JI, Rund BR, Simonsen E, Vaglum P, Velden WT, McGlashan T, Friis S (2017)
A 10-year follow-up study of violent victimization in first episode psychosis: Risk and protective factors
Psychiatry Res, 259, 545-549
DOI 10.1016/j.psychres.2017.11.013, PubMed 29172178

Gardsjord ES, Romm KL, Røssberg JI, Friis S, Barder HE, Evensen J, Haahr U, Ten Velden Hegelstad W, Joa I, Johannessen JO, Langeveld J, Larsen TK, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan T, Melle I (2017)
Is going into stable symptomatic remission associated with a more positive development of life satisfaction? A 10-year follow-up study of first episode psychosis
Schizophr Res, 193, 364-369
DOI 10.1016/j.schres.2017.07.006, PubMed 28701275

Weibell MA, Hegelstad WTV, Auestad B, Bramness J, Evensen J, Haahr U, Joa I, Johannessen JO, Larsen TK, Melle I, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan T, McGorry P, Friis S (2017)
The Effect of Substance Use on 10-Year Outcome in First-Episode Psychosis
Schizophr Bull, 43 (4), 843-851
DOI 10.1093/schbul/sbw179, PubMed 28199703

Falkum E, Klungsøyr O, Lystad JU, Bull HC, Evensen S, Martinsen EW, Friis S, Ueland T (2017)
Vocational rehabilitation for adults with psychotic disorders in a Scandinavian welfare society
BMC Psychiatry, 17 (1), 24
DOI 10.1186/s12888-016-1183-0, PubMed 28095813

Furre A, Falk RS, Sandvik L, Friis S, Knutzen M, Hanssen-Bauer K (2017)
Characteristics of adolescents frequently restrained in acute psychiatric units in Norway: a nationwide study
Child Adolesc Psychiatry Ment Health, 11, 3
DOI 10.1186/s13034-016-0136-1, PubMed 28096898

Hegelstad WT, Bronnick KS, Barder HE, Evensen JH, Haahr U, Joa I, Johannessen JO, Langeveld J, Larsen TK, Melle I, Opjordsmoen S, Rund BR, Rossberg JI, Simonsen E, Vaglum PW, McGlashan TH, Friis S (2016)
Preventing Poor Vocational Functioning in Psychosis Through Early Intervention
Psychiatr Serv, 68 (1), 100-103
DOI 10.1176/appi.ps.201500451, PubMed 27582238

Gardsjord ES, Romm KL, Friis S, Barder HE, Evensen J, Haahr U, ten Velden Hegelstad W, Joa I, Johannessen JO, Langeveld J, Larsen TK, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan T, Melle I, Røssberg JI (2016)
Subjective quality of life in first-episode psychosis. A ten year follow-up study
Schizophr Res, 172 (1-3), 23-8
DOI 10.1016/j.schres.2016.02.034, PubMed 26947210

Furre A, Sandvik L, Friis S, Knutzen M, Hanssen-Bauer K (2016)
A nationwide study of why and how acute adolescent psychiatric units use restraint
Psychiatry Res, 237, 60-6
DOI 10.1016/j.psychres.2016.01.067, PubMed 26921053

Haahr UH, Larsen TK, Simonsen E, Rund BR, Joa I, Rossberg JI, Johannessen JO, Langeveld J, Evensen J, Trauelsen AMH, Vaglum P, Opjordsmoen S, Hegelstad WTV, Friis S, McGlashan T, Melle I (2016)
Relation between premorbid adjustment, duration of untreated psychosis and close interpersonal trauma in first-episode psychosis
Early Interv Psychiatry, 12 (3), 316-323
DOI 10.1111/eip.12315, PubMed 26800653

Kvale A, Bunkan BH, Opjordsmoen S, Friis S (2016)
The Global Body Examination (GBE): A useful instrument for examination of patients with long-lasting musculoskeletal and/or psychological disorders
Eur. J. Physiother., 18 (2), 137-143
DOI 10.3109/21679169.2016.1149217

Bendiksen B, Aase H, Diep LM, Svensson E, Friis S, Zeiner P (2015)
The Associations Between Pre- and Postnatal Maternal Symptoms of Distress and Preschooler's Symptoms of ADHD, Oppositional Defiant Disorder, Conduct Disorder, and Anxiety
J Atten Disord, 24 (7), 1057-1069
DOI 10.1177/1087054715616185, PubMed 26647350

Friis S, Melle I, Johannessen JO, Røssberg JI, Barder HE, Evensen JH, Haahr U, Ten Velden Hegelstad W, Joa I, Langeveld J, Larsen TK, Opjordsmoen S, Rund BR, Simonsen E, Vaglum PW, McGlashan TH (2015)
Early Predictors of Ten-Year Course in First-Episode Psychosis
Psychiatr Serv, 67 (4), 438-43
DOI 10.1176/appi.ps.201400558, PubMed 26567932

Nilsen L, Norheim I, Frich JC, Friis S, Røssberg JI (2015)
Challenges for group leaders working with families dealing with early psychosis: a qualitative study
BMC Psychiatry, 15, 141
DOI 10.1186/s12888-015-0540-8, PubMed 26134829

Rund BR, Barder HE, Evensen J, Haahr U, ten Velden Hegelstad W, Joa I, Johannessen JO, Langeveld J, Larsen TK, Melle I, Opjordsmoen S, Røssberg JI, Simonsen E, Sundet K, Vaglum P, McGlashan T, Friis S (2015)
Neurocognition and Duration of Psychosis: A 10-year Follow-up of First-Episode Patients
Schizophr Bull, 42 (1), 87-95
DOI 10.1093/schbul/sbv083, PubMed 26101305

Bull H, Ueland T, Lystad JU, Evensen S, Friis S, Martinsen EW, Falkum E (2014)
Validation of the work behavior inventory
Nord J Psychiatry, 69 (4), 300-6
DOI 10.3109/08039488.2014.973902, PubMed 25393653

Furre A, Sandvik L, Heyerdahl S, Friis S, Knutzen M, Hanssen-Bauer K (2014)
Characteristics of adolescents subjected to restraint in acute psychiatric units in Norway: a case-control study
Psychiatr Serv, 65 (11), 1367-72
DOI 10.1176/appi.ps.201300429, PubMed 24980114

Bendiksen B, Svensson E, Aase H, Reichborn-Kjennerud T, Friis S, Myhre AM, Zeiner P (2014)
Co-Occurrence of ODD and CD in Preschool Children With Symptoms of ADHD
J Atten Disord, 21 (9), 741-752
DOI 10.1177/1087054714538655, PubMed 24994876

Sönmez N, Røssberg JI, Evensen J, Barder HE, Haahr U, Ten Velden Hegelstad W, Joa I, Johannessen JO, Langeveld H, Larsen TK, Melle I, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan T, Friis S (2014)
Depressive symptoms in first-episode psychosis: a 10-year follow-up study
Early Interv Psychiatry, 10 (3), 227-33
DOI 10.1111/eip.12163, PubMed 24956976

Nilsen L, Frich JC, Friis S, Norheim I, Røssberg JI (2014)
Participants' perceived benefits of family intervention following a first episode of psychosis: a qualitative study
Early Interv Psychiatry, 10 (2), 152-9
DOI 10.1111/eip.12153, PubMed 24861325

Langeveld J, Bjørkly S, Auestad B, Barder H, Evensen J, Ten Velden Hegelstad W, Joa I, Johannessen JO, Larsen TK, Melle I, Opjordsmoen S, Røssberg JI, Rund BR, Simonsen E, Vaglum P, McGlashan T, Friis S (2014)
Treatment and violent behavior in persons with first episode psychosis during a 10-year prospective follow-up study
Schizophr Res, 156 (2-3), 272-6
DOI 10.1016/j.schres.2014.04.010, PubMed 24837683

Bendiksen B, Aase H, Svensson E, Friis S, Myhre AM, Reichborn-Kjennerud T, Zeiner P (2014)
Impairment in Young Preschool Children with Symptoms of Attention-Deficit/Hyperactivity Disorder and Co-occurring Oppositional Defiant Disorder and Conduct Disorder
Scand. J. Child Adolesc. Psychiatr. Psychol., 2 (3), 95-105
DOI 10.21307/sjcapp-2014-014

Nilsen L, Frich JC, Friis S, Røssberg JI (2014)
Patients' and family members' experiences of a psychoeducational family intervention after a first episode psychosis: a qualitative study
Issues Ment Health Nurs, 35 (1), 58-68
DOI 10.3109/01612840.2013.837992, PubMed 24350752

Knutzen M, Bjørkly S, Eidhammer G, Lorentzen S, Mjøsund NH, Opjordsmoen S, Sandvik L, Friis S (2013)
Characteristics of patients frequently subjected to pharmacological and mechanical restraint--a register study in three Norwegian acute psychiatric wards
Psychiatry Res, 215 (1), 127-33
DOI 10.1016/j.psychres.2013.10.024, PubMed 24230996

Barder HE, Sundet K, Rund BR, Evensen J, Haahr U, Ten Velden Hegelstad W, Joa I, Johannessen JO, Langeveld J, Larsen TK, Melle I, Opjordsmoen S, Røssberg JI, Simonsen E, Vaglum P, McGlashan T, Friis S (2013)
Ten year neurocognitive trajectories in first-episode psychosis
Front Hum Neurosci, 7, 643
DOI 10.3389/fnhum.2013.00643, PubMed 24109449

Barder HE, Sundet K, Rund BR, Evensen J, Haahr U, Ten Velden Hegelstad W, Joa I, Johannessen JO, Langeveld H, Larsen TK, Melle I, Opjordsmoen S, Røssberg JI, Simonsen E, Vaglum P, McGlashan T, Friis S (2013)
Neurocognitive development in first episode psychosis 5 years follow-up: associations between illness severity and cognitive course
Schizophr Res, 149 (1-3), 63-9
DOI 10.1016/j.schres.2013.06.016, PubMed 23810121

ten Velden Hegelstad W, Joa I, Barder H, Evensen J, Haahr U, Johannessen JO, Langeveld J, Melle I, Opjordsmoen S, Røssberg JI, Rund BR, Simonsen E, Vaglum P, McGlashan T, Friis S, Larsen TK (2013)
Variation in duration of untreated psychosis in an 18-year perspective
Early Interv Psychiatry, 8 (4), 323-31
DOI 10.1111/eip.12057, PubMed 23773272

Faerden A, Barrett EA, Nesvåg R, Friis S, Finset A, Marder SR, Ventura J, Andreassen OA, Agartz I, Melle I (2013)
Apathy, poor verbal memory and male gender predict lower psychosocial functioning one year after the first treatment of psychosis
Psychiatry Res, 210 (1), 55-61
DOI 10.1016/j.psychres.2013.02.007, PubMed 23489592

Kvale A, Bunkan BH, Opjordsmoen S, Friis S (2013)
Development of the Palpation Domain for Muscle and Skin in the Global Body Examination
J. Musculoskelet. Pain, 21 (1), 9-18
DOI 10.3109/10582452.2012.762821

Ten Velden Hegelstad W, Haahr U, Larsen TK, Auestad B, Barder H, Evensen J, Joa I, Johannessen JO, Langeveld J, Melle I, Opjordsmoen S, Rossberg JI, Rund BR, Simonsen E, Vaglum P, McGlashan T, Friis S (2012)
Early detection, early symptom progression and symptomatic remission after ten years in a first episode of psychosis study
Schizophr Res, 143 (2-3), 337-43
DOI 10.1016/j.schres.2012.10.027, PubMed 23219862

Knutzen M, Bjørkly S, Eidhammer G, Lorentzen S, Helen Mjøsund N, Opjordsmoen S, Sandvik L, Friis S (2012)
Mechanical and pharmacological restraints in acute psychiatric wards--why and how are they used?
Psychiatry Res, 209 (1), 91-7
DOI 10.1016/j.psychres.2012.11.017, PubMed 23219102

Friis S, Kvåle A, Opjordsmoen S, Bunkan BH (2012)
The Global Body Examination (GBE). A useful instrument for evaluation of respiration
Adv Physiother, 14 (4), 146-154
DOI 10.3109/14038196.2012.704943, PubMed 23243389

Evensen J, Røssberg JI, Barder H, Haahr U, Hegelstad WT, Joa I, Johannessen JO, Larsen TK, Melle I, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan T, Friis S (2012)
Flat affect and social functioning: a 10 year follow-up study of first episode psychosis patients
Schizophr Res, 139 (1-3), 99-104
DOI 10.1016/j.schres.2012.04.019, PubMed 22627124

Friis S (2012)
[Can you be cured from schizophrenia?]
Tidsskr Nor Laegeforen, 132 (7), 847-8
DOI 10.4045/tidsskr.12.0270, PubMed 22511103

Hegelstad WT, Larsen TK, Auestad B, Evensen J, Haahr U, Joa I, Johannesen JO, Langeveld J, Melle I, Opjordsmoen S, Rossberg JI, Rund BR, Simonsen E, Sundet K, Vaglum P, Friis S, McGlashan T (2012)
Long-term follow-up of the TIPS early detection in psychosis study: effects on 10-year outcome
Am J Psychiatry, 169 (4), 374-80
DOI 10.1176/appi.ajp.2011.11030459, PubMed 22407080

Langeveld J, Joa I, Friis S, ten Velden Hegelstad W, Melle I, Johannessen JO, Opjordsmoen S, Simonsen E, Vaglum P, Auestad B, McGlashan T, Larsen TK (2012)
A comparison of adolescent- and adult-onset first-episode, non-affective psychosis: 2-year follow-up
Eur Arch Psychiatry Clin Neurosci, 262 (7), 599-605
DOI 10.1007/s00406-012-0308-9, PubMed 22441715

Evensen J, Røssberg JI, Barder H, Haahr U, Hegelstad Wt, Joa I, Johannessen JO, Larsen TK, Melle I, Opjordsmoen S, Rund BR, Simonsen E, Sundet K, Vaglum P, Friis S, McGlashan T (2012)
Apathy in first episode psychosis patients: a ten year longitudinal follow-up study
Schizophr Res, 136 (1-3), 19-24
DOI 10.1016/j.schres.2011.12.019, PubMed 22285655

Haahr U, Simonsen E, Røssberg JI, Johannessen JO, Larsen TK, Melle I, Opjordsmoen S, Rund BR, Vaglum P, Friis S, McGlashan T (2012)
Patient satisfaction with treatment in first-episode psychosis
Nord J Psychiatry, 66 (5), 329-35
DOI 10.3109/08039488.2011.644808, PubMed 22250962

Bakken TL, Rossberg JI, Friis S (2012)
The ward atmosphere scale for psychiatric inpatients with intellectual disability: a pilot study
Adv. Ment. Health Intellet. Disabil., 6 (5), 265-272
DOI 10.1108/20441281211261159

Nesvold H, Ormstad K, Friis S (2011)
To be used or not to be used, that is the question: legal use of forensic and clinical information collected in a self-referral sexual assault centre
J Forensic Sci, 56 (5), 1156-62
DOI 10.1111/j.1556-4029.2011.01879.x, PubMed 21827469

Nesvold H, Ormstad K, Friis S (2011)
Sexual assault centres and police reporting--an important arena for medical/legal interaction
J Forensic Sci, 56 (5), 1163-9
DOI 10.1111/j.1556-4029.2011.01880.x, PubMed 21827470

Kvåle A, Bunkan BH, Opjordsmoen S, Friis S (2011)
Development of the movement domain in the global body examination
Physiother Theory Pract, 28 (1), 41-9
DOI 10.3109/09593985.2011.561419, PubMed 21682584

Tandberg M, Ueland T, Sundet K, Haahr U, Joa I, Johannessen JO, Larsen TK, Opjordsmoen S, Rund BR, Røssberg JI, Simonsen E, Vaglum P, Melle I, Friis S, McGlashan T (2011)
Neurocognition and occupational functioning in patients with first-episode psychosis: a 2-year follow-up study
Psychiatry Res, 188 (3), 334-42
DOI 10.1016/j.psychres.2011.04.021, PubMed 21575993

Knutzen M, Mjosund NH, Eidhammer G, Lorentzen S, Opjordsmoen S, Sandvik L, Friis S (2011)
Characteristics of psychiatric inpatients who experienced restraint and those who did not: a case-control study
Psychiatr Serv, 62 (5), 492-7
DOI 10.1176/ps.62.5.pss6205_0492, PubMed 21532074

Evensen J, Røssberg JI, Haahr U, ten Velden Hegelstad W, Joa I, Johannessen JO, Langeveld H, Larsen TK, Melle I, Opjordsmoen S, Rund BR, Simonsen E, Sundet K, Vaglum P, Friis S, McGlashan T (2011)
Contrasting monosymptomatic patients with hallucinations and delusions in first-episode psychosis patients: a five-year longitudinal follow-up study
Psychopathology, 44 (2), 90-7
DOI 10.1159/000319789, PubMed 21228615

Melle I, Røssberg JI, Joa I, Friis S, Haahr U, Johannessen JO, Larsen TK, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan T (2010)
The development of subjective quality of life over the first 2 years in first-episode psychosis
J Nerv Ment Dis, 198 (12), 864-9
DOI 10.1097/NMD.0b013e3181fe7258, PubMed 21135636

Johannessen JO, Joa I, Auestad B, Haahr U, Larsen TK, Melle I, Opjordsmoen S, Simonsen P, Rund BR, Simonsen E, Vaglum P, Friis S, McGlashan T (2010)
First-episode psychosis patients recruited into treatment via early detection teams versus ordinary pathways: course and health service use during 5 years
Early Interv Psychiatry, 5 (1), 70-5
DOI 10.1111/j.1751-7893.2010.00201.x, PubMed 21272278

Simonsen C, Sundet K, Vaskinn A, Ueland T, Romm KL, Hellvin T, Melle I, Friis S, Andreassen OA (2010)
Psychosocial function in schizophrenia and bipolar disorder: Relationship to neurocognition and clinical symptoms
J Int Neuropsychol Soc, 16 (5), 771-83
DOI 10.1017/S1355617710000573, PubMed 20509984

Rossberg JI, Karterud S, Pedersen G, Friis S (2010)
Psychiatric symptoms and countertransference feelings: an empirical investigation
Psychiatry Res, 178 (1), 191-5
DOI 10.1016/j.psychres.2009.09.019, PubMed 20452056

Jónsdóttir H, Opjordsmoen S, Birkenaes AB, Engh JA, Ringen PA, Vaskinn A, Aamo TO, Friis S, Andreassen OA (2010)
Medication adherence in outpatients with severe mental disorders: relation between self-reports and serum level
J Clin Psychopharmacol, 30 (2), 169-75
DOI 10.1097/JCP.0b013e3181d2191e, PubMed 20520290

Melle I, Johannessen JO, Friis S, Haahr U, Joa I, Larsen TK, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan T (2010)
Course and predictors of suicidality over the first two years of treatment in first-episode schizophrenia spectrum psychosis
Arch Suicide Res, 14 (2), 158-70
DOI 10.1080/13811111003704787, PubMed 20455151

Faerden A, Finset A, Friis S, Agartz I, Barrett EA, Nesvåg R, Andreassen OA, Marder SR, Melle I (2010)
Apathy in first episode psychosis patients: one year follow up
Schizophr Res, 116 (1), 20-6
DOI 10.1016/j.schres.2009.10.014, PubMed 19948392

Kvale A, Bunkan BH, Opjordsmoen S, Ljunggren E, Friis S (2010)
Development of the Posture domain in the Global Body Examination (GBE)
Eur. J. Physiother., 12 (3), 157-165
DOI 10.3109/14038196.2010.489618

Faerden A, Friis S, Agartz I, Barrett EA, Nesvåg R, Finset A, Melle I (2009)
Apathy and functioning in first-episode psychosis
Psychiatr Serv, 60 (11), 1495-503
DOI 10.1176/ps.2009.60.11.1495, PubMed 19880468

Simonsen C, Sundet K, Vaskinn A, Birkenaes AB, Engh JA, Faerden A, Jónsdóttir H, Ringen PA, Opjordsmoen S, Melle I, Friis S, Andreassen OA (2009)
Neurocognitive dysfunction in bipolar and schizophrenia spectrum disorders depends on history of psychosis rather than diagnostic group
Schizophr Bull, 37 (1), 73-83
DOI 10.1093/schbul/sbp034, PubMed 19443616

Birkenaes AB, Birkeland KI, Friis S, Opjordsmoen S, Andreassen OA (2009)
Hormonal markers of metabolic dysregulation in patients with severe mental disorders after olanzapine treatment under real-life conditions
J Clin Psychopharmacol, 29 (2), 109-16
DOI 10.1097/JCP.0b013e31819b95fc, PubMed 19512971

Opjordsmoen S, Melle I, Friis S, Haahr U, Johannessen JO, Larsen TK, Rund BR, Simonsen E, Vaglum P, McGlashan TH (2009)
Stability of medication in early psychosis: a comparison between second-generation and low-dose first-generation antipsychotics
Early Interv Psychiatry, 3 (1), 58-65
DOI 10.1111/j.1751-7893.2008.00103.x, PubMed 21352176

Engh JA, Friis S, Birkenaes AB, Jónsdóttir H, Klungsøyr O, Ringen PA, Simonsen C, Vaskinn A, Opjordsmoen S, Andreassen OA (2009)
Delusions are associated with poor cognitive insight in schizophrenia
Schizophr Bull, 36 (4), 830-5
DOI 10.1093/schbul/sbn193, PubMed 19176474

Vaskinn A, Sundet K, Hultman CM, Friis S, Andreassen OA (2009)
Social problem-solving in high-functioning schizophrenia: specific deficits in sending skills
Psychiatry Res, 165 (3), 215-23
DOI 10.1016/j.psychres.2007.11.009, PubMed 19136154

Faerden A, Vaskinn A, Finset A, Agartz I, Ann Barrett E, Friis S, Simonsen C, Andreassen OA, Melle I (2009)
Apathy is associated with executive functioning in first episode psychosis
BMC Psychiatry, 9, 1
DOI 10.1186/1471-244X-9-1, PubMed 19133132

Vaskinn A, Sundet K, Friis S, Ueland T, Simonsen C, Birkenaes AB, Engh JA, Jónsdóttir H, Opjordsmoen S, Ringen PA, Andreassen OA (2009)
Using the Wisconsin Card Sorting Test to assess learning potential in normal IQ schizophrenia: does it have potential?
Nord J Psychiatry, 63 (5), 405-11
DOI 10.1080/08039480902879941, PubMed 19365785

Nesset MB, Rossberg JI, Almvik R, Friis S (2008)
Can a focused staff training programme improve the ward atmosphere and patient satisfaction in a forensic psychiatric hospital? A pilot study
Scand J Caring Sci, 23 (1), 117-24
DOI 10.1111/j.1471-6712.2008.00597.x, PubMed 19170956

Simonsen E, Haahr U, Mortensen EL, Friis S, Johannessen JO, Larsen TK, Melle I, Opjordsmoen S, Rund BR, McGlashan T, Vaglum P (2008)
Personality disorders in first-episode psychosis
Personal. Ment. Health, 2 (4), 230-239
DOI 10.1002/pmh.49

Rossberg JI, Melle I, Opjordsmoen S, Friis S (2008)
The relationship between staff members' working conditions and patients' perceptions of the treatment environment
Int J Soc Psychiatry, 54 (5), 437-46
DOI 10.1177/0020764008090689, PubMed 18786905

Rossberg JI, Karterud S, Pedersen G, Friis S (2008)
Specific personality traits evoke different countertransference reactions: an empirical study
J Nerv Ment Dis, 196 (9), 702-8
DOI 10.1097/NMD.0b013e318186de80, PubMed 18791432

Melle I, Larsen TK, Haahr U, Friis S, Johannesen JO, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan T (2008)
Prevention of negative symptom psychopathologies in first-episode schizophrenia: two-year effects of reducing the duration of untreated psychosis
Arch Gen Psychiatry, 65 (6), 634-40
DOI 10.1001/archpsyc.65.6.634, PubMed 18519821

Jónsdóttir H, Engh JA, Friis S, Birkenaes A, Ringen PA, Vaskinn A, Sundet K, Opjordsmoen S, Andreassen OA (2008)
Measurement of insight in patients with bipolar disorder: are self-rated scales developed for patients with schizophrenia applicable?
J Nerv Ment Dis, 196 (4), 333-5
DOI 10.1097/NMD.0b013e31816a62b2, PubMed 18414129

Birkenaes AB, Birkeland KI, Engh JA, Faerden A, Jonsdottir H, Ringen PA, Friis S, Opjordsmoen S, Andreassen OA (2008)
Dyslipidemia independent of body mass in antipsychotic-treated patients under real-life conditions
J Clin Psychopharmacol, 28 (2), 132-7
DOI 10.1097/JCP.0b013e318166c4f7, PubMed 18344722

Vaskinn A, Sundet K, Friis S, Ueland T, Simonsen C, Birkenaes AB, Engh JA, Opjordsmoen S, Andreassen OA (2008)
Can learning potential in schizophrenia be assessed with the standard CVLT-II? An exploratory study
Scand J Psychol, 49 (2), 179-86
DOI 10.1111/j.1467-9450.2008.00627.x, PubMed 18352988

Simonsen C, Sundet K, Vaskinn A, Birkenaes AB, Engh JA, Hansen CF, Jónsdóttir H, Ringen PA, Opjordsmoen S, Friis S, Andreassen OA (2008)
Neurocognitive profiles in bipolar I and bipolar II disorder: differences in pattern and magnitude of dysfunction
Bipolar Disord, 10 (2), 245-55
DOI 10.1111/j.1399-5618.2007.00492.x, PubMed 18271903

Vaskinn A, Sundet K, Friis S, Simonsen C, Birkenaes AB, Jónsdóttir H, Ringen PA, Andreassen OA (2008)
Emotion perception and learning potential: mediators between neurocognition and social problem-solving in schizophrenia?
J Int Neuropsychol Soc, 14 (2), 279-88
DOI 10.1017/S1355617708080314, PubMed 18282325

Bringager CB, Gauer K, Arnesen H, Friis S, Dammen T (2008)
Nonfearful panic disorder in chest-pain patients: status after nine-year follow-up
Psychosomatics, 49 (5), 426-37
DOI 10.1176/appi.psy.49.5.426, PubMed 18794512

Haahr U, Friis S, Larsen TK, Melle I, Johannessen JO, Opjordsmoen S, Simonsen E, Rund BR, Vaglum P, McGlashan T (2008)
First-episode psychosis: diagnostic stability over one and two years
Psychopathology, 41 (5), 322-9
DOI 10.1159/000146070, PubMed 18635935

Bringager CB, Friis S, Arnesen H, Dammen T (2008)
Nine-year follow-up of panic disorder in chest pain patients: clinical course and predictors of outcome
Gen Hosp Psychiatry, 30 (2), 138-46
DOI 10.1016/j.genhosppsych.2007.12.009, PubMed 18291295

Dammen T, Ekeberg Ø, Arnesen H, Friis S (2008)
Health-related quality of life in non-cardiac chest pain patients with and without panic disorder
Int J Psychiatry Med, 38 (3), 271-86
DOI 10.2190/PM.38.3.d, PubMed 19069572

Nesvold H, Friis S, Ormstad K (2008)
Sexual assault centers: attendance rates, and differences between early and late presenting cases
Acta Obstet Gynecol Scand, 87 (7), 707-15
DOI 10.1080/00016340802189847, PubMed 18607821

Engh JA, Friis S, Birkenaes AB, Jónsdóttir H, Ringen PA, Ruud T, Sundet KS, Opjordsmoen S, Andreassen OA (2007)
Measuring cognitive insight in schizophrenia and bipolar disorder: a comparative study
BMC Psychiatry, 7, 71
DOI 10.1186/1471-244X-7-71, PubMed 18072961

Larsen TK, Melle I, Friis S, Joa I, Johannessen JO, Opjordsmoen S, Simonsen E, Vaglum P, McGlashan TH (2007)
One-year effect of changing duration of untreated psychosis in a single catchment area
Br J Psychiatry Suppl, 51, s128-32
DOI 10.1192/bjp.191.51.s128, PubMed 18055929

Joa I, Johannessen JO, Auestad B, Friis S, Opjordsmoen S, Simonsen E, Vaglum P, McGlashan T, Larsen TK (2007)
Effects on referral patterns of reducing intensive informational campaigns about first-episode psychosis
Early Interv Psychiatry, 1 (4), 340-5
DOI 10.1111/j.1751-7893.2007.00047.x, PubMed 21352122

Faerden A, Nesvåg R, Barrett EA, Agartz I, Finset A, Friis S, Rossberg JI, Melle I (2007)
Assessing apathy: the use of the Apathy Evaluation Scale in first episode psychosis
Eur Psychiatry, 23 (1), 33-9
DOI 10.1016/j.eurpsy.2007.09.002, PubMed 18029152

Bull Bringager C, Arnesen H, Friis S, Husebye T, Dammen T (2007)
A long-term follow-up study of chest pain patients: effect of panic disorder on mortality, morbidity, and quality of life
Cardiology, 110 (1), 8-14
DOI 10.1159/000109400, PubMed 17934263

Joa I, Johannessen JO, Auestad B, Friis S, McGlashan T, Melle I, Opjordsmoen S, Simonsen E, Vaglum P, Larsen TK (2007)
The key to reducing duration of untreated first psychosis: information campaigns
Schizophr Bull, 34 (3), 466-72
DOI 10.1093/schbul/sbm095, PubMed 17905788

Bjørngaard JH, Ruud T, Friis S (2007)
The impact of mental illness on patient satisfaction with the therapeutic relationship: a multilevel analysis
Soc Psychiatry Psychiatr Epidemiol, 42 (10), 803-9
DOI 10.1007/s00127-007-0229-5, PubMed 17622476

Birkenaes AB, Opjordsmoen S, Brunborg C, Engh JA, Jonsdottir H, Ringen PA, Simonsen C, Vaskinn A, Birkeland KI, Friis S, Sundet K, Andreassen OA (2007)
The level of cardiovascular risk factors in bipolar disorder equals that of schizophrenia: a comparative study
J Clin Psychiatry, 68 (6), 917-23
DOI 10.4088/jcp.v68n0614, PubMed 17592917

Johannessen JO, Friis S, Joa I, Haahr U, Larsen TK, Melle I, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan T (2007)
First-episode psychosis patients recruited into treatment via early detection teams versus ordinary pathways: course, outcome and health service use during first 2 years
Early Interv Psychiatry, 1 (1), 40-8
DOI 10.1111/j.1751-7893.2007.00003.x, PubMed 21352107

Rund BR, Melle I, Friis S, Johannessen JO, Larsen TK, Midbøe LJ, Opjordsmoen S, Simonsen E, Vaglum P, McGlashan T (2007)
The course of neurocognitive functioning in first-episode psychosis and its relation to premorbid adjustment, duration of untreated psychosis, and relapse
Schizophr Res, 91 (1-3), 132-40
DOI 10.1016/j.schres.2006.11.030, PubMed 17258891

Rossberg JI, Karterud S, Pedersen G, Friis S (2007)
An empirical study of countertransference reactions toward patients with personality disorders
Compr Psychiatry, 48 (3), 225-30
DOI 10.1016/j.comppsych.2007.02.002, PubMed 17445515

Larsen TK, Melle I, Auestad B, Friis S, Haahr U, Johannessen JO, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan TH (2006)
Substance abuse in first-episode non-affective psychosis
Schizophr Res, 88 (1-3), 55-62
DOI 10.1016/j.schres.2006.07.018, PubMed 16971092

Larsen TK, Melle I, Auestad B, Friis S, Haahr U, Johannessen JO, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan T (2006)
Early detection of first-episode psychosis: the effect on 1-year outcome
Schizophr Bull, 32 (4), 758-64
DOI 10.1093/schbul/sbl005, PubMed 16809640

Melle I, Johannesen JO, Friis S, Haahr U, Joa I, Larsen TK, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan T (2006)
Early detection of the first episode of schizophrenia and suicidal behavior
Am J Psychiatry, 163 (5), 800-4
DOI 10.1176/ajp.2006.163.5.800, PubMed 16648319

Birkenaes AB, Søgaard AJ, Engh JA, Jonsdottir H, Ringen PA, Vaskinn A, Friis S, Sundet K, Opjordsmoen S, Andreassen OA (2006)
Sociodemographic characteristics and cardiovascular risk factors in patients with severe mental disorders compared with the general population
J Clin Psychiatry, 67 (3), 425-33
DOI 10.4088/jcp.v67n0314, PubMed 16649830

Dammen T, Bringager CB, Arnesen H, Ekeberg O, Friis S (2006)
A 1-year follow-up study of chest-pain patients with and without panic disorder
Gen Hosp Psychiatry, 28 (6), 516-24
DOI 10.1016/j.genhosppsych.2006.08.005, PubMed 17088168

Hoffart A, Hedley LM, Thornes K, Larsen SM, Friis S (2006)
Therapists' emotional reactions to patients as a mediator in cognitive behavioural treatment of panic disorder with agoraphobia
Cogn Behav Ther, 35 (3), 174-82
DOI 10.1080/16506070600862518, PubMed 16952901

Friis S, Vaglum P, Haahr U, Johannessen JO, Larsen TK, Melle I, Opjordsmoen S, Rund BR, Simonsen E, McGlashan TH (2005)
Effect of an early detection programme on duration of untreated psychosis: part of the Scandinavian TIPS study
Br J Psychiatry Suppl, 48, s29-32
DOI 10.1192/bjp.187.48.s29, PubMed 16055804

Johannessen JO, Larsen TK, Joa I, Melle I, Friis S, Opjordsmoen S, Rund BR, Simonsen E, Vaglum P, McGlashan TH (2005)
Pathways to care for first-episode psychosis in an early detection healthcare sector: part of the Scandinavian TIPS study
Br J Psychiatry Suppl, 48, s24-8
DOI 10.1192/bjp.187.48.s24, PubMed 16055803

Larsen TK, Friis S, Haahr U, Johannessen JO, Melle I, Opjordsmoen S, Rund BR, Simonsen E, Vaglum PV, McGlashan TH (2004)
Premorbid adjustment in first-episode non-affective psychosis: distinct patterns of pre-onset course
Br J Psychiatry, 185, 108-15
DOI 10.1192/bjp.185.2.108, PubMed 15286061

Rossberg JI, Friis S (2004)
Patients' and staff's perceptions of the psychiatric ward environment
Psychiatr Serv, 55 (7), 798-803
DOI 10.1176/appi.ps.55.7.798, PubMed 15232020

Rund BR, Melle I, Friis S, Larsen TK, Midbøe LJ, Opjordsmoen S, Simonsen E, Vaglum P, McGlashan T (2004)
Neurocognitive dysfunction in first-episode psychosis: correlates with symptoms, premorbid adjustment, and duration of untreated psychosis
Am J Psychiatry, 161 (3), 466-72
DOI 10.1176/appi.ajp.161.3.466, PubMed 14992972

Melle I, Larsen TK, Haahr U, Friis S, Johannessen JO, Opjordsmoen S, Simonsen E, Rund BR, Vaglum P, McGlashan T (2004)
Reducing the duration of untreated first-episode psychosis: effects on clinical presentation
Arch Gen Psychiatry, 61 (2), 143-50
DOI 10.1001/archpsyc.61.2.143, PubMed 14757590

Bringager CB, Dammen T, Friis S (2004)
Nonfearful panic disorder in chest pain patients
Psychosomatics, 45 (1), 69-79
DOI 10.1176/appi.psy.45.1.69, PubMed 14709762

Dammen T, Arnesen H, Ekeberg O, Friis S (2004)
Psychological factors, pain attribution and medical morbidity in chest-pain patients with and without coronary artery disease
Gen Hosp Psychiatry, 26 (6), 463-9
DOI 10.1016/j.genhosppsych.2004.08.004, PubMed 15567212

Rossberg JI, Friis S (2003)
Staff members' emotional reactions to aggressive and suicidal behavior of inpatients
Psychiatr Serv, 54 (10), 1388-94
DOI 10.1176/appi.ps.54.10.1388, PubMed 14557526

Karterud S, Pedersen G, Bjordal E, Brabrand J, Friis S, Haaseth O, Haavaldsen G, Irion T, Leirvåg H, Tørum E, Urnes O (2003)
Day treatment of patients with personality disorders: experiences from a Norwegian treatment research network
J Pers Disord, 17 (3), 243-62
DOI 10.1521/pedi.17.3.243.22151, PubMed 12839103

Friis S, Larsen TK, Melle I (2003)
[Therapy of psychoses]
Tidsskr Nor Laegeforen, 123 (10), 1393
PubMed 12806685

Gjelstad K, Løvdahl H, Ruud T, Friis S (2003)
[Compulsory admissions for observation in emergency psychiatric departments--discharge next day?]
Tidsskr Nor Laegeforen, 123 (7), 917-20
PubMed 12737060

Røssberg JI, Hoffart A, Friis S (2003)
Psychiatric staff members' emotional reactions toward patients. A psychometric evaluation of an extended version of the Feeling Word Checklist (FWC-58)
Nord J Psychiatry, 57 (1), 45-53
DOI 10.1080/08039480310000257, PubMed 12745791

Chiesa M, Bateman A, Wilberg T, Friis S (2002)
Patients' characteristics, outcome and cost-benefit of hospital-based treatment for patients with personality disorder: a comparison of three different programmes
Psychol Psychother, 75 (Pt 4), 381-92
DOI 10.1348/147608302321151899, PubMed 12674121

Friis S, Larsen TK (2002)
[Does individual psychotherapy have a place in the treatment of schizophrenia?]
Tidsskr Nor Laegeforen, 122 (22), 2210-2
PubMed 12426900

Hauff E, Varvin S, Laake P, Melle I, Vaglum P, Friis S (2002)
Inpatient psychotherapy compared with usual care for patients who have schizophrenic psychoses
Psychiatr Serv, 53 (4), 471-3
DOI 10.1176/appi.ps.53.4.471, PubMed 11919362

Review articles

Ruud T, Friis S (2021)
Community-based Mental Health Services in Norway
Consort Psychiatr, 2 (1), 47-54
DOI 10.17816/CP43, PubMed 38601095

Engh JA, Sundet K, Simonsen C, Vaskinn A, Lagerberg TV, Opjordsmoen S, Friis S, Andreassen OA (2011)
Verbal learning contributes to cognitive insight in schizophrenia independently of affective and psychotic symptoms
Prog Neuropsychopharmacol Biol Psychiatry, 35 (4), 1059-63
DOI 10.1016/j.pnpbp.2011.02.021, PubMed 21392553

Other articles

Ruud T, Friis S (2022)
Continuity of care and therapeutic relationships as critical elements in acute psychiatric care
World Psychiatry, 21 (2), 241-242
DOI 10.1002/wps.20966, PubMed 35524593

Srihari VH, Guloksuz S, Friis S (2020)
Natural History, Not Lead Time
Am J Psychiatry, 177 (12), 1185
DOI 10.1176/appi.ajp.2020.20040402, PubMed 33256447

Friis S, Melle I, McGlashan TH (2019)
Symptom remission at 12-weeks is a strong predictor for long term outcome
Psychol Med, 50 (14), 2464
DOI 10.1017/S0033291719003465, PubMed 31814559

Øvergaard KR, Oerbeck B, Friis S, Pripp AH, Biele G, Aase H, Zeiner P (2018)
Dr. Øvergaard et al. Reply
J Am Acad Child Adolesc Psychiatry, 57 (9), 701-702
DOI 10.1016/j.jaac.2018.05.021, PubMed 30196877

Melle I, Olav Johannesen J, Haahr UH, Ten Velden Hegelstad W, Joa I, Langeveld J, Larsen TK, Ilner Opjordsmoen S, Qin P, Ivar Røssberg J, Rishovd Rund B, Simonsen E, Vaglum PJW, McGlashan TH, Friis S (2017)
Causes and predictors of premature death in first-episode schizophrenia spectrum disorders
World Psychiatry, 16 (2), 217-218
DOI 10.1002/wps.20431, PubMed 28498600

Guloksuz S, Li F, Tek C, Woods SW, McGlashan TH, Friis S, Srihari VH (2016)
Analyzing the Duration of Untreated Psychosis: Quantile Regression
JAMA Psychiatry, 73 (10), 1094-1095
DOI 10.1001/jamapsychiatry.2016.2013, PubMed 27580422

Dahl HS, Ulberg R, Friis S, Perry JC, Høglend PA (2016)
Therapists' Inadequate Feelings and Long-Term Effect of Transference Work
Psychother Psychosom, 85 (5), 309-10
DOI 10.1159/000444647, PubMed 27513346

Friis S (2015)
[Seclusion--punishment or support?]
Tidsskr Nor Laegeforen, 135 (1), 8
DOI 10.4045/tidsskr.14.1271, PubMed 25589099

Knutzen M, Bjorkly S, Eidhammer G, Lorentzen S, Mjosund NH, Opjordsmoen S, Sandvik L, Friis S (2014)
Characteristics of patients frequently subjected to pharmacological and mechanical restraint - A register study in three Norwegian acute psychiatric wards (vol 215, pg 127, 2014)
Psychiatry Res., 219 (3), 714
DOI 10.1016/j.psychres.2014.03.013

Barder HE, Sundet K, Rund B, Evensen J, Haahr U, Hegelstad W, Joa I, Johannessen JO, Langeveld J, Larsen TK, Melle I, Opjordsmoen S, Rossberg JI, Simonsen E, Vaglum P, McGlashan T, Friis S (2014)
Ten year neurocognitive trajectories in first-episode psychosis (vol 7, pg 643, 2013)
Front. Hum. Neurosci., 8, 319
DOI 10.3389/fnhum.2014.00319

Friis S, Barder H, Evensen JH, Haahr U, Hegelstad WT, Joa I, Johannessen JO, Langeveld J, Larsen TK, Melle I, Opjordsmoen S, Rund BR, Røssberg JI, Simonsen E, Sundet K, Vaglum P, McGlashan T (2012)
The TIPS study and bias: replies to Dr Amos
Aust N Z J Psychiatry, 46 (9), 905-7
DOI 10.1177/0004867412451344, PubMed 22956571

Friis S (2010)
Early specialised treatment for first-episode psychosis: does it make a difference?
Br J Psychiatry, 196 (5), 339-40
DOI 10.1192/bjp.bp.109.075143, PubMed 20435954

Friis S (2009)
Psychosis
Acta Psychiatr Scand, 121 (1), 79; author reply 79-80
DOI 10.1111/j.1600-0447.2009.01495.x, PubMed 19895622

Fjell A, Bloch Thorsen GR, Friis S, Johannessen JO, Larsen TK, Lie K, Lyse HG, Melle I, Simonsen E, Smeby NA, Øxnevad AL, McFarlane WR, Vaglum P, McGlashan T (2007)
Multifamily group treatment in a program for patients with first-episode psychosis: experiences from the TIPS project
Psychiatr Serv, 58 (2), 171-3
DOI 10.1176/ps.2007.58.2.171, PubMed 17287370

Books

Brofoss KE, Larsen F, Friis S (2009)
Evaluering av Opptrappingsplanen for psykisk helse (2001-2009): sluttrapport - syntese og analyse av evalueringens delprosjekter
Forskningsrådet, Divisjon for vitenskap, Oslo, 148 s.
BIBSYS 092674097, ISBN 978-82-12-02677-3

Book chapters

Friis S, Andreassen OA, Melle I (2007)
Psykiatriske forskningsmetoder
In Epidemiologiske og kliniske forskningsmetoder, Gyldendal akademisk, Oslo, [373]-[400]
BIBSYS 071650067

Larsen TK, Friis S (2003)
Psykosocial behandling af schizofreni: noe å bry seg om?
In Medicinsk årbog, Norli, Oslo, 2003, s. 69-76
BIBSYS 042227240

Larsen TK, Friis S (2003)
Psykosocial behandling af schizofreni: noe å bry seg om?
In Medicinsk årbog, Norli, Oslo, 2003, s. 69-76
BIBSYS 042192218