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