[1] Univ Iceland, Fac Psychol, Saemundargata 12, IS-102 Reykjavik, Iceland
[2] Norwegian Univ Sci & Technol, Dept Child & Adolescent Psychiat, Reg Ctr Child & Youth Mental Hlth, Trondheim, Norway
[3] St Olavs Univ Hosp, Trondheim, Norway
[4] Univ Gothenburg, Inst Neurosci & Physiol, Gothenburg, Sweden
[5] Aarhus Univ Hosp Psychiat, Dept Child & Adolescent Psychiat, Aarhus, Denmark
[6] Sahlgrens Univ Hosp, Queen Silvia Childrens Hosp, Dept Child & Adolescent Psychiat, Gothenburg, Sweden
[7] Vestre Viken Hosp, Dept Child & Adolescent Psychiat, Div Mental Hlth & Addict, Drammen, Norway
[8] Akershus Univ Hosp, Div Mental Hlth Serv, Lorenskog, Norway