[1] Univ Montreal Hosp, Res Ctr, Montreal, PQ, Canada
[2] Inst Natl Sante Publ Quebec, 190 Cremazie Blvd E, Montreal, PQ H2P 1E2, Canada
[3] Univ Montreal, Dept Social & Prevent Med, Montreal, PQ, Canada
[4] McGill Univ, Dept Epidemiol Biostat & Occupat Hlth, Montreal, PQ, Canada
[5] McGill Univ, Dept Psychiat, Montreal, PQ, Canada
[6] Sainte Justine Hosp, Dept Pediat, Montreal, PQ, Canada