1. Department of Anesthesia, St. Paul’s Hospital, Providence Health Care , Vancouver, British Columbia, Canada
2. Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia , Vancouver, British Columbia, Canada
3. Department of Anesthesiology, Pain Management, and Perioperative Medicine, Dalhousie University , Halifax, Nova Scotia, Canada
4. Division of Vascular Surgery, St. Paul’s Hospital, The University of British Columbia , Vancouver, British Columbia, Canada