1. Respiratory Fellow, Montreal Chest Institute, McGill University, Respiratory Epidemiology Unit, 3650 St. Urban, Room K1.24, Montréal, Québec, H2X 2P4, Canada
2. Professor of Medicine, Montreal Chest Institute, McGill University, Respiratory Epidemiology Unit, 3650 St. Urban, Room K1.24, Montréal, Québec, H2X 2P4, Canada.