1. Department of Respiratory Therapy, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R3E 0T6, Canada
2. Winnipeg Regional Health Authority, Winnipeg, MB R3E 0M1, Canada
3. Misericordia Health Centre, Winnipeg, MB R3C 1A2, Canada
4. The Manitoba Lung Association, Winnipeg, MB R3A 1M5, Canada