University of Pittsburgh - Department of Human Genetics, University of British Columbia (UBC) - Division of Respiratory Medicine, University of Calgary - Division of Respiratory Medicine, University of British Columbia (UBC) - Division of Respiratory Medicine, University of Saskatchewan, McGill University - Division of Respiratory Medicine, affiliation not provided to SSRN, University of Toronto, McMaster University, Medical University of South Carolina, University of Pittsburgh - Department of Environmental and Occupational Health, University of Pittsburgh, University of Pittsburgh, University of Pittsburgh - Department of Medicine and Pulmonary and Critical Care Medicine, University of Pittsburgh, University of British Columbia (UBC) - Division of Respiratory Medicine and University of Pittsburgh - Medical Center (UPMC)

McGill University - Division of Experimental Medicine, McGill University - Division of Respiratory Medicine, Respiratory Epidemiology and Clinical Research Unit, Research Institute of McGill University Health Centre, McGill University, Montreal, Canada, Independent, Independent, Independent, Independent, Independent and Respiratory Epidemiology and Clinical Research Unit, Research Institute of McGill University Health Centre, McGill University, Montreal, Canada