1 Division of Urology, Departments of Surgery and Surgical Oncology, Princess Margaret Cancer Centre, University Health Network and the University of Toronto, 700 University Avenue, 6th floor, Toronto, Ontario, M5G 1Z5, Canada.
2 Martini-Klinik Prostate Cancer Center and the Department of Urology, University Hospital Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.