[1] Unity Hlth, St Michaels Hosp, Li Ka Shing Knowledge Inst, Toronto, ON, Canada
[2] Univ Toronto, Dept Med, Div Respirol, Toronto, ON, Canada
[3] Dept Family & Community Med Univ Toronto, Dept Family & Community Med, Toronto, ON, Canada
[4] Univ Sherbrooke, Fac Medecine & Sci St, Sherbrooke, PQ, Canada
[5] Queens Univ, Dept Med, Div Respirol, Kingston, ON, Canada
[6] Univ Montreal, Fac Medecine, Montreal, PQ, Canada
[7] Ctr Hosp Univ Sainte Justine, Dept Pediat Emergency Med, Montreal, PQ, Canada
[8] Univ Saskatchewan, Div Respirol Crit Care & Sleep Med, Dept Med, Saskatoon, SK, Canada