1. Thrombosis/Haemostasis Research Group, The Ottawa Hospital, Ottawa, Ontario, Canada
2. School of Nursing, Queen's University, Kingston, Ontario, Canada and Senior Scientist, Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
3. Ottawa Hospital Research Institute and Associate Professor, Medicine, Epidemiology and Community Medicine, University of Ottawa, Ontario, Canada
4. School of Nursing, Queen's University, Ontario, Canada.