[1] Hosp Psychiat, Inst Basic Psychiat Res, Aarhus, Denmark
[2] Hosp Psychiat, Mood Disorder Res Unit, Aarhus, Denmark
[3] UCL, Sch Med, Dept Psychiat, Mol Psychiat Lab, London WC1E 6BT, England
[4] St Bartholomews Hosp, Royal London Sch Med Dent, London, England
[5] Odense Univ, Dept Clin Biochem & Genet, DK-5230 Odense M, Denmark