Christopher J D Wallis1, Raj Satkunasivam2. 1. Division of Urology, Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada; and at the Institute for Health Policy, Management &Evaluation, University of Toronto, 155 College Street, Toronto, Ontario, M5T 3M6, Canada. 2. Division of Urology, Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Toronto, Ontario, M4N 3M5, Canada.