1. Division of Urology, Department of Surgery, University of Toronto, Toronto, Canada.
2. Institute for Clinical Evaluative Sciences, London, Canada.
3. Department of Obstetrics and Gynecology, Sunnybrook Health Science Centre, Toronto, Canada.
4. Department of Epidemiology and Biostatistics, Schulich School of Medicine and Dentistry, Western University, London, Canada.
5. Division of Urology, Department of Surgery, St. Joseph's Health Care, Western University, London, Canada.