1. Department of Community Health & Epidemiology, Dalhousie University, Halifax, Canada
2. Center for Clinical Epidemiology, Lady Davis Institute for Medical Research, Montreal, Canada
3. Departments of Medicine and of Epidemiology, Biostatistics, and Occupational Health, McGill University, Montreal, Canada
4. College of Pharmacy, Faculty of Health, Dalhousie University, Halifax, Canada
5. W. K. Kellogg Health Sciences Library, Dalhousie University, Halifax, Canada