[1] Univ Western Ontario, Dept Epidemiol & Biostat, London, ON, Canada
[2] Univ Western Ontario, Dept Psychiat, London, ON, Canada
[3] Douglas Hosp, Res Ctr, Div Clin Res, Montreal, PQ, Canada
[4] McGill Univ, Dept Psychiat, Montreal, PQ, Canada
[5] Lawson Hlth Res Inst, London, ON, Canada
[6] Douglas Hosp, Res Ctr, PEPP Montreal, Montreal, PQ, Canada
[7] London Hlth Sci Ctr, London, ON, Canada
[8] Univ Calgary, Dept Community Hlth Sci, Calgary, AB, Canada
[9] Univ Calgary, Dept Clin Neurosci, Calgary, AB, Canada
[10] Univ Western Ontario, Dept Pediat, London, ON N6A 3K7, Canada
[11] Child Hlth Res Inst, London, ON, Canada