[1] Kings Coll London, Inst Psychiat, Dept Neurosci, London WC2R 2LS, England
[2] Kings Coll London, Inst Psychiat, Dept Psychol Med, London WC2R 2LS, England
[3] Heidelberg Univ, Med Fac Mannheim, Cent Inst Mental Hlth, Dept Psychiat & Psychotherapy, D-6800 Mannheim, Germany