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- From the Departments of *Medicine, †Health Administration and ‡Public Health Sciences, University of Toronto, Toronto, Ont.; §the Institute for Clinical Evaluative Sciences, Toronto, Ont.; ¶the University of Toronto Clinical Epidemiology and Health Care Research Program, Sunnybrook Unit, Toronto, Ont.; and **the Department of Research Design and Biostatistics, Sunnybrook & Women's College Health Sciences Centre, Sunnybrook Site, Toronto, Ont.