1 Department of Medicine, Respiratory Division, McGill University Health Centre, Montreal, Québec, Canada.
2 Department of Medicine, Division of Pulmonary Medicine, University of Alberta, Edmonton, Alberta, Canada.
3 Division of Respirology, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada; and.
4 Division of Respirology, Critical Care and Sleep Medicine, and Respiratory Research Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.