[1] Univ Oslo, NORMENT, KG Jebsen Psychosis Res Ctr, Inst Clin Med, Oslo, Norway
[2] Oslo Univ Hosp, Div Mental Hlth & Addict, Oslo, Norway
[3] Oslo Univ Hosp, Div Med Genet, Oslo, Norway
[4] Oslo Univ Hosp, NevSom, Dept Rare Disorders & Disabil, Oslo, Norway
[5] Autism Soc Norway, POB 6726 Etterstad, N-0609 Oslo, Norway
[6] Heidelberg Univ, Med Fac Mannheim, Cent Inst Mental Hlth, Dept Genet Epidemiol Psychiat, Bergheimer Str 58, D-69115 Heidelberg, Germany
[7] Univ Calif San Diego, Dept Family Med & Publ Hlth, San Diego, CA 92103 USA