[1] Univ Queensland, Sch Publ Hlth, Fac Med, Publ Hlth Bldg, Herston, Qld 4006, Australia
[2] Univ Queensland, Sch Med, Princess Alexandra Hosp, Fac Med, Woolloongabba, Qld 4102, Australia
[3] Dalhousie Univ, Dept Psychiat, Fac Med, Halifax, NS, Canada
[4] Dalhousie Univ, Dept Community Hlth, Fac Med, Halifax, NS, Canada
[5] Dalhousie Univ, Dept Epidemiol, Fac Med, Halifax, NS, Canada
[6] Univ Iowa, Div Dev & Behav Pediat, Stead Family Dept Pediat, Iowa City, IA USA
[7] Univ Iowa, Stead Family Childrens Hosp, Ctr Disabil & Dev, Iowa City, IA USA
[8] Univ Queensland, Queensland Alcohol & Drug Res & Educ Ctr, Herston, Qld 4006, Australia
[9] Univ Queensland, Fac Humanities & Social Sci, Sch Social Sci, St Lucia, Qld 4072, Australia