Department of Surgery, The Ottawa Hospital, University of Ottawa, Ottawa, ON, Canada. Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada. Library Services, The Ottawa Hospital, Ottawa, ON, Canada. Department of Anesthesiology, The Ottawa Hospital, University of Ottawa, Ottawa, ON, Canada. Department of Medicine, The Ottawa Hospital, University of Ottawa, Ottawa, ON, Canada. Canadian Blood Services, Ottawa, ON, Canada.