[1] McGill Univ, Dept Epidemiol Biostat & Occupat Hlth, Montreal, PQ, Canada
[2] Montreal Chest Inst, Resp Epidemiol & Clin Res Unit, Montreal, PQ, Canada
[3] McGill Univ, Dept Med, Ctr Hlth, Montreal, PQ, Canada
[4] McGill Univ, Fac Med, Global Hlth Programs, Montreal, PQ, Canada