1. Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada;
2. Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada;
3. Department of Medicine, University of Toronto, Toronto, Ontario, Canada;
4. Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada;
5. Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada;
6. Clinical Epidemiology, Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada;
7. Centre for Heart Lung Innovation, University of British Columbia, Vancouver, British Columbia, Canada;
8. Department of Physical Therapy, University of British Columbia, Vancouver, British Columbia, Canada;
9. Department of Family and Community Medicine, University of Toronto, Toronto, Ontario, Canada;
10. Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada;
11. Department of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada;
12. Division of Respirology, Queen Elizabeth II Health Sciences Centre, Halifax, Nova Scotia, Canada
13. Dalla Lana School for Public Health, Toronto, Ontario, Canada