1. Respiratory Epidemiology and Clinical Research Unit, Research Institute of the McGill University Health Centre - Montreal, Quebec, Canada
2. Respiratory Division and Sleep Laboratory, McGill University Health Centre - Montreal, Quebec, Canada
3. Clinica Alemana de Santiago, Facultad de Medicina, Universidad del Desarrollo, Santiago, Chile
4. Montreal Neurological Hospital, McGill University Health Centre - Montreal, Quebec, Canada
5. Deptartment of Medicine and Deptartment of Epidemiology, Biostatistics and Occupational Health, McGill University – Montreal, Quebec, Canada
6. University of Toronto, Ontario, Canada