[1] Univ Stavanger, Stavanger, Norway
[2] Stavanger Univ Hosp, TIPS Ctr Clin Res Psychosis, Stavanger, Norway
[3] Univ Bergen, Bergen, Norway
[4] Yale Univ, New Haven, CT 06520 USA
[5] Oslo Univ Hosp, NORMENT KG Jebsen Ctr Psychosis Res, Oslo, Norway
[6] Univ Oslo, Inst Clin Med, Oslo, Norway
[7] Leeds Trinity Univ, Sch Social & Hlth Sci, Leeds, W Yorkshire, England