Laura V Duggan1, George Mastoras2, Gregory L Bryson2. 1. Departments of Anesthesiology and Pain Medicine (Duggan, Bryson), and Emergency Medicine (Mastoras), University of Ottawa; Clinical Epidemiology Program (Bryson), Ottawa Hospital Research Institute, Ottawa, Ont. laduggan@toh.ca. 2. Departments of Anesthesiology and Pain Medicine (Duggan, Bryson), and Emergency Medicine (Mastoras), University of Ottawa; Clinical Epidemiology Program (Bryson), Ottawa Hospital Research Institute, Ottawa, Ont.