1. Vanderbilt University Medical Center Department of Urology, , Nashville, Tennessee, USA
2. Augusta University Section of Urology, Department of Surgery, , Augusta, Georgia, USA
3. University of Toronto Division of Urology, Department of Surgery, , Toronto, Ontario, Canada
4. Department of Surgery, University of Toronto Division of Urology, , Toronto, Ontario, Canada
5. Fox Chase Cancer Center , Philadelphia, Pennsylvania, USA
6. University Medical Center Department of Urology, Vanderbilt , Nashville, Tennessee, USA
7. Mount Sinai Hospital Division of Urology, Department of Surgery, , Toronto, Ontario, Canada