1 Department of Medicine, 1001 Decarie Blvd, Montreal H4A 3J1, QC, Canada
2 Research Institute of the McGill University Health Centre, 1001 Decarie Blvd, Montreal H4A 3J1, QC, Canada
3 Department of Epidemiology and Biostatistics, 1001 Decarie Blvd, Montreal H4A 3J1, QC, Canada
4 Respiratory Epidemiology and Clinical Research Unit, Montreal Chest Institute, McGill University, Montreal, QC, Canada
5 Department of Medicine, McMaster University, Hamilton, ON, Canada
6 The UBC James Hogg Research Centre, University of British Columbia, Vancouver, BC, Canada