[1] Hosp Sick Children, Dept Pediat, Div Adolescent Med, Toronto, ON M5G 1X8, Canada
[2] Univ Toronto, Toronto, ON, Canada
[3] Univ Penn, Childrens Hosp Philadelphia, Craig Dalsimer Div Adolescent Med, Perelman Sch Med,Dept Pediat, Philadelphia, PA 19104 USA
[4] Univ Melbourne, Murdoch Childrens Res Inst, Royal Childrens Hosp, Dept Paediat,Ctr Adolescent Hlth, Melbourne, Vic, Australia
[5] Stanford Univ, Sch Med, Dept Child Psychiat & Pediat, Palo Alto, CA 94304 USA
[6] Lucile Packard Childrens Hosp, Palo Alto, CA USA
[7] Univ Chicago, Div Child & Adolescent Psychiat, Dept Psychiat & Behav Neurosci, Chicago, IL 60637 USA