1. The University of British Columbia, Vancouver, British Columbia, Canada
2. Clinical Research Unit, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada
3. Centre for Healthy Active Living, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada
4. Division of Respiratory Medicine, Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada
5. Department of Pediatrics, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada