1. Faculty of Nursing, University of Toronto, Toronto, Ontario, Canada
2. Department of Anaesthesia, Dalhousie University, Pain Management Unit, Queen Elizabeth II Health Sciences Centre, Halifax, Nova Scotia, Canada
3. Departments of Anaesthesia & Psychology, Dalhousie University, IWK Grace Health Centre, Halifax, Nova Scotia, Canada
4. Department of Medicine, University of Toronto, Etobicoke General Hospital, Toronto, Ontario, Canada