[1] Direct Sante Publ, Montreal Ctr, Regie Reg Sante & Serv Sociaux, Montreal, PQ H2L 1M3, Canada
[2] McGill Univ, Ctr Hlth, Div Prevent Med, Montreal, PQ, Canada
[3] McGill Univ, Dept Epidemiol & Biostat, Joint Dept Occupat Hlth, Montreal, PQ, Canada
[4] Univ Montreal, Dept Social & Prevent Med, Montreal, PQ, Canada