[1] Kings Mill Hosp, Genitourinary Med Clin, Sutton In Ashfield, England
[2] Univ London Imperial Coll Sci Technol & Med, Div Neurosci & Mental Hlth, Dept Psychol Med, London, England
[3] Cent N W London Mental Hlth NHS Trust, London, England
[4] Kings Coll London, Inst Psychiat, London WC2R 2LS, England
[5] London Sch Hyg & Trop Med, Noncommunicable Dis Epidemiol Unit, London WC1, England