Jean Bourbeau1, Lancelot M Pinto2, Andrea Benedetti3. 1. Respiratory Epidemiology and Clinical Research Unit, Montréal Chest Institute, 3650 St Urbain, Room K1.32, Montréal, QC, Canada H2X2 P4; Department of Medicine, McGill University Health Centre, McGill University, Montréal, QC, Canada H2X 2PA. Electronic address: jean.bourbeau@mcgill.ca. 2. Respiratory Epidemiology and Clinical Research Unit, Montréal Chest Institute, 3650 St Urbain, Room K1.32, Montréal, QC, Canada H2X2 P4. 3. Respiratory Epidemiology and Clinical Research Unit, Montréal Chest Institute, 3650 St Urbain, Room K1.32, Montréal, QC, Canada H2X2 P4; Department of Medicine, McGill University Health Centre, McGill University, Montréal, QC, Canada H2X 2PA; Department of Epidemiology, Biostatistics and Occupational Health, McGill University Health Centre, McGill University, Montréal, QC, Canada H2X 2PA.