1 Department of Anesthesiology and Pain Medicine, Temerty Faculty of Medicine, University of Toronto, Room 3318, Medical Sciences Building, 1 King's College Circle, Toronto, ON, M5S 1A8, Canada. beverley.orser@utoronto.ca.
2 Department of Family Medicine, Queen's University, Kingston, ON, Canada.
3 Department of Anesthesia and Perioperative Medicine, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada.