[1] Univ Turku, Dept Psychiat, FIN-20520 Turku, Finland
[2] Univ Turku, Turku PET Ctr, FIN-20520 Turku, Finland
[3] Univ Turku, Turku PET Ctr, Turku 20521, Finland
[4] Univ Turku, Cent Hosp, Turku 20521, Finland
[5] Univ Calif Los Angeles, Sch Med, Dept Psychol, Los Angeles, CA 90095 USA
[6] Univ Calif Los Angeles, Sch Med, Dept Psychiat, Los Angeles, CA 90095 USA
[7] Univ Calif Los Angeles, Sch Med, Dept Human Genet, Los Angeles, CA 90095 USA
[8] Natl Publ Hlth Inst, Dept Mental Hlth & Alcohol Res, SF-00300 Helsinki, Finland
[9] Abo Akad Univ, Dept Psychol, SF-20500 Turku, Finland
[10] Univ Helsinki, Dept Publ Hlth, FIN-00014 Helsinki, Finland