1. Department of Physical Therapy, Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
2. Department of Physical Therapy, Surrey Memorial Hospital, Fraser Health, Surrey, British Columbia, Canada
3. Department of Public Health, University of Copenhagen, Copenhagen, Denmark; and University Hospitals' Centre for Health Research, Rigshospitalet, Copenhagen, Denmark
4. Department of Physical Therapy, University of British Columbia; Centre for Heart and Lung Innovation, University of British Columbia; and St. Paul's Hospital, Vancouver, British Columbia, Canada
5. Department of Physical Therapy, Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Alberta, Canada
6. Department of Physical Therapy, Faculty of Medicine, University of British Columbia, Wesbrook Mall, Vancouver, British Columbia V6T 1Z3, Canada