[1] Univ Nottingham, Sch Med, Div Psychiat & Appl Psychol, Queens Med Ctr, Nottingham NG7 2UH, England
[2] Inst Mental Hlth, CANDAL, Nottingham, England
[3] Univ Bristol, Sch Social & Community Med, Bristol, Avon, England
[4] Univ Leicester, Dept Hlth Sci, Leicester, Leics, England
[5] Univ Queensland, Sch Populat Hlth, Herston, Qld, Australia
[6] Univ Sheffield, Sheffield, S Yorkshire, England
[7] Univ Hosp Leicester NHS Trust, Dept Clin Genet, Leicester, Leics, England
[8] Univ Oxford, Natl Perinatal Epidemiol Unit, Oxford, England