[1] Karolinska Inst, Dept Mol Med, Neurogenet Unit, Karolinska Hosp, S-17176 Stockholm, Sweden
[2] Umea Univ, Div Psychiat, Dept Clin Sci, S-90185 Umea, Sweden
[3] Natl Publ Hlth Inst, Dept Mental Hlth & Alcohol Res, FIN-00300 Helsinki, Finland
[4] Natl Publ Hlth Inst, Dept Human Mol Genet, FIN-00300 Helsinki, Finland
[5] Univ Helsinki, Dept Med Genet, FIN-00014 Helsinki, Finland
[6] Univ Bonn, Dept Psychiat, D-53105 Bonn, Germany
[7] Stockholm Univ, Dept Math Stat, S-10691 Stockholm, Sweden
[8] Karolinska Inst, Dept Med Epidemiol, S-17177 Stockholm, Sweden