[1] Sunnybrook Hlth Sci Ctr, G1 06,2075 Bayview Ave, Toronto, ON M4N 3M5, Canada
[2] Inst Clin Evaluat Sci, Toronto, ON, Canada
[3] Univ Toronto, Dept Med, Toronto, ON, Canada
[4] Hosp Sick Children, Res Inst, Toronto, ON, Canada
[5] Univ Toronto, Inst Hlth Policy Management & Evaluat, Toronto, ON, Canada
[6] Univ Ottawa, Ottawa Hosp, Clin Epidemiol, Res Inst, Ottawa, ON, Canada
[7] Univ British Columbia, Ctr Heart Lung Innovat, Vancouver, BC, Canada
[8] Univ British Columbia, Dept Phys Therapy, Vancouver, BC, Canada
[9] Univ Toronto, Dept Family & Community Med, Toronto, ON, Canada
[10] Univ Hlth Network, Toronto Western Hosp, Toronto, ON, Canada
[11] Dalhousie Univ, Dept Med, Halifax, NS, Canada
[12] Queen Elizabeth 2 Hlth Sci Ctr, Div Respirol, Halifax, NS, Canada
[13] Dalla Lana Sch Publ Hlth, Toronto, ON, Canada