1. Department of Medicine; Institute of Medical Sciences; Keenan Centre for Biomedical Research; Li Ka Shing Knowledge institute; St. Michael's Hospital; University of Toronto; Toronto ON Canada
2. Department of Mathematics; SUNY-Brockport; Brockport NY USA
3. Respiratory Epidemiology and Clinical Research Unit; McGill University Health Centre; Montreal QC Canada
4. Department of Medicine; McGill University; Montreal QC Canada
5. Department of Epidemiology; Biostatistics and Occupational health; McGill University; Montreal QC Canada
6. Montreal Chest Institute and the Meakins-Christie Laboratories; Montreal QC Canada
7. Research Centre; Hôpital du Sacré-Cœur de; Montreal QC Canada
8. Faculty of Medicine; University de Montreal; Montreal QC Canada