1. Department of Physical Therapy, University of British Columbia, Vancouver, BC Canada
2. Department of Physical Therapy, and Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC Canada
3. Department of Radiology, and Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC Canada
4. Division of Respiratory Medicine, Department of Medicine, University of British Columbia, Vancouver, BC Canada
5. Department of Physical Therapy, University of Toronto, Toronto, ON Canada