[1] Univ British Columbia, Vancouver Gen Hosp, Vancouver Coastal Hlth Res Inst, Div Resp Med,Ctr Heart & Lung Hlth, Vancouver, BC, Canada
[2] Simon Fraser Univ, Studies Methodol & Philosophy Psychol Sci, Burnaby, BC, Canada
[3] Univ British Columbia, Dept Med, Resp Med Div, Vancouver, BC, Canada
[4] Univ British Columbia, Fac Populat & Publ, Div Epidemiol Biostat & Publ Hlth Practice, Vancouver, BC, Canada
[5] Trinity Western Univ, Sch Nursing, Langley, BC, Canada
[6] Univ Ottawa, Div Respirol, Dept Med, Ottawa, ON, Canada
[7] St Michaels Hosp, Dept Med, Div Respirol, Toronto, ON, Canada
[8] Univ Toronto, West Pk Hosp, West Pk Resp Rehabil Serv Toronto, Toronto, ON, Canada
[9] Univ Quebec Montreal, Montreal, PQ, Canada
[10] Univ Laval, Dept Med, Div Respirol, Quebec City, PQ, Canada
[11] Univ Montreal, Ctr Hosp, Resp Med, Montreal, PQ, Canada