[1] Univ Bristol, Bristol Med Sch, Ctr Acad Child Hlth, Populat Hlth Sci, Bristol BS8 2BN, England
[2] Univ Bristol, Bristol Med Sch, Populat Hlth Sci, Bristol BS8 2BN, England
[3] Vagelos Coll Phys & Surg, Dept Psychiat, New York, NY USA
[4] Columbia Univ, Mailman Sch Publ Hlth, Dept Epidemiol, New York, NY USA
[5] New York State Psychiat Inst & Hosp, Div Child & Adolescent Psychiat, New York, NY USA