1. The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
2. Department of Medicine, University of Ottawa Faculty of Medicine, Ottawa, Ontario, Canada
3. School of Epidemiology and Public Health, University of Ottawa Faculty of Medicine, Ottawa, Ontario, Canada
4. ICES (formerly Institute for Clinical Evaluative Sciences), Ottawa, Ontario, Canada
5. Department of Medicine at Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
6. Cumming School of Medicine, Department of Medicine, University of Calgary, Calgary, Alberta, Canada
7. Department of Respiratory Medicine, Department of Pulmonary and Critical Care Medicine, The First Hospital of Lanzhou University, Lanzhou, Gansu, China
8. The First Clinical Medical College of Lanzhou University, Lanzhou, China
9. Department of Obstetrics, Gynecology, and Newborn Care, University of Ottawa Faculty of Medicine), Ottawa, Ontario, Canada
10. Department of Medicine, University of Toronto, Toronto, Ontario, Canada
11. ICES, Toronto, Ontario, Canada
12. Department of Medicine, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada