[1] Kings Coll London, Inst Psychiat, London, England
[2] Kings Coll London, Inst Psychiat, Ctr Epidemiol & Publ Mental Hlth, Hlth Serv & Populat Res Dept, London, England
[3] Kings Coll London, Inst Psychiat, Psychol Med, London, England
[4] IOP, London, England