[1] Karolinska Inst, Dept Clin Neurosci, Psychiat Sect, SE-17176 Stockholm, Sweden
[2] Univ Bonn, Inst Human Genet, D-5300 Bonn, Germany
[3] Karolinska Inst, Dept Nursing, Stockholm, Sweden
[4] Natl & Stockholm Cty Council Suicide Res & Preven, Natl Inst Psychosocial Factors & Hlth, Stockholm, Sweden
[5] Karolinska Inst, Dept Publ Hlth Sci, Stockholm, Sweden
[6] Univ Antwerp, Dept Med Genet, Wilrijk, Belgium
[7] Karolinska Inst, Dept Clin Neurosci, Clin Alcohol & Drug Addict Res Sect, Stockholm, Sweden