1. School of Physical and Occupational Therapy, McGill University, Montreal, Quebec, Canada
2. Centre for Health Outcomes Research, and
3. Respiratory Epidemiology and Clinical Research Unit, Research Institute, McGill University Health Center, Montreal, Quebec, Canada
4. School of Health and Social Care, Teesside University, Middlesbrough, United Kingdom
5. College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada; and
6. Mount Sinai Hospital Centre, Montreal, Quebec, Canada