[1] Univ Liverpool, Sch Populat Community & Behav Sci, Child Mental Hlth Unit, Alder Hey Childrens NHS Fdn Trust, Liverpool L12 2AP, Merseyside, England
[2] Human Dev Res Fdn, Islamabad, Pakistan
[3] Inst Psychiat, Rawalpindi, Pakistan
[4] Barnet Enfield & Haringey Mental Hlth Trust, London, England
[5] Columbia Univ, Ctr Child & Family Life Epidemiol, Dept Epidemiol, Mailman Sch Publ Hlth, New York, NY USA