[1] Murdoch Childrens Res Inst, Melbourne, Vic, Australia
[2] Royal Childrens Hosp, Ctr Adolescent Hlth, Melbourne, Vic 3052, Australia
[3] Univ Melbourne, Dept Paediat, Melbourne, Vic, Australia
[4] Royal Childrens Hosp, Clin Epidemiol & Biostat Unit, Melbourne, Vic 3052, Australia
[5] UCL, UCL Inst Child Hlth, London, England
[6] La Trobe Univ, Dept Psychol & Counseling, Melbourne, Vic, Australia
[7] Univ Melbourne, Melbourne Sch Psychol Sci, Melbourne, Vic, Australia
[8] Univ Oregon, Dept Psychol, Eugene, OR 97403 USA