[1] Univ Munster, Dept Psychiat, D-48149 Munster, Germany
[2] Univ Melbourne, Melbourne Med Sch, Dept Psychiat, Parkville, Vic, Australia
[3] Univ Melbourne, Florey Inst Neurosci & Mental Hlth, Parkville, Vic, Australia
[4] Univ N Carolina, Dept Psychiat, Chapel Hill, NC 27515 USA
[5] Univ N Carolina, Dept Genet, Chapel Hill, NC 27515 USA
[6] Karolinska Inst, Dept Med Epidemiol & Biostat, Stockholm, Sweden
[7] Johns Hopkins Univ, Sch Med, Dept Psychiat & Behav Sci, Baltimore, MD 21205 USA