1. Department of Surgery, Western University, London, Ontario, Canada2Institute for Clinical Evaluative Sciences, London, Ontario, Canada3Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
2. Institute for Clinical Evaluative Sciences, London, Ontario, Canada
3. Division of Urology, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
4. Institute for Clinical Evaluative Sciences, London, Ontario, Canada3Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada