1. Department of Medicine McMaster University Hamilton Ontario Canada
2. Centre for Lung Health, Vancouver General Hospital University of British Columbia Vancouver British Columbia Canada
3. Quebec Heart and Lung Institute, Laval University Quebec Quebec Canada
4. Department of Medicine University of Saskatchewan Saskatoon Saskatchewan Canada
5. Department of Medicine Cumming School of Medicine Calgary Alberta Canada
6. Division of Pulmonary Medicine, Department of Medicine, Faculty of Medicine and Dentistry University of Alberta Edmonton Alberta Canada