[1] Zikei Hosp, Zikei Inst Psychiat, Dept Psychiat, Okayama, Japan
[2] Kawasaki Med Grad Sch, Dept Psychiat, Kurashiki, Okayama, Japan
[3] Kings Coll London, Inst Psychiat Psychol & Neurosci, Hlth Serv & Populat Res Dept, London, England
[4] Kings Coll London, Inst Psychiat Psychol & Neurosci, Biostat & Hlth Informat Dept, London, England