1. Department of AnesthesiologyLeiden University Medical Center Leiden The Netherlands
2. Centre for Heart, Lung, and Vascular HealthSchool of Health and Exercise ScienceUniversity of British Columbia Kelowna BC Canada
3. Department of KinesiologyUniversity of Waterloo Waterloo ON Canada
4. Southern Medical ProgramUniversity of British Columbia Kelowna BC Canada
5. Division of Pulmonary & Critical Care MedicineVA Puget Sound Health Care SystemUniversity of Washington Seattle WA USA