[1] Karolinska Univ Hosp, Div Clin Pharmacol, Dept Lab Med, Karolinska Inst, Stockholm, Sweden
[2] Karolinska Univ Hosp, Ctr Pharmacoepidemiol, Dept Med, Karolinska Inst, Stockholm, Sweden
[3] Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden
[4] Yokohama City Univ, Sch Med, Dept Psychiat, Yokohama, Kanagawa 232, Japan