Jonathan S Zipursky1, Alex Cressman2, David N Juurlink3. 1. Fellow, Clinical Pharmacology and Toxicology, University of Toronto, Toronto, Ont. 2. Resident Physician, Faculty of Medicine, University of Toronto, Toronto, Ont. 3. Professor, Departments of Medicine and Pediatrics, University of Toronto; Scientist, Institute for Clinical Evaluative Sciences, Toronto, Ont.