1. Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
2. Home Oxygen Program, Vancouver Coastal Health, Vancouver, British Columbia, Canada
3. Physical Therapy, University of British Columbia, Vancouver, British Columbia, Canada
4. Department of Medicine, Centre for Heart Lung Innovation, Vancouver, British Columbia, Canada
5. Respiratory and Sleep Medicine, Austin Health, Melbourne, Australia
6. Department of Respiratory and Sleep Medicine, Institute for Breathing and Sleep, Melbourne, Australia
7. Faculty of Medicine, University of Melbourne, Melbourne, Australia