[1] McGill Univ, Resp Epidemiol & Clin Res Unit, Montreal, PQ H2X 2P4, Canada
[2] McGill Univ, Royal Victoria Hosp, Hlth Ctr, Montreal, PQ H3A 2T5, Canada
[3] Univ Montreal, Hop Sacre Coeur, Montreal, PQ, Canada
[4] Univ Montreal, Hop Maisonneuve Rosemont, Montreal, PQ, Canada
[5] Univ Montreal, Hop Notre Dame, Montreal, PQ, Canada
[6] Univ Montreal, Ctr Hosp Affilles, Montreal, PQ, Canada
[7] Univ Laval, Hop Sacrement, Ctr Affilie, Laval, PQ, Canada
[8] Univ Laval, Hop Laval, Inst Cardiol & Pneumol, Ste Foy, PQ, Canada
[9] Univ Sherbrooke, Ctr Hosp, Sherbrooke, PQ J1K 2R1, Canada