1. Department of Urology, Mayo Clinic, Rochester, Minnesota
2. Division of Urology, Princess Margaret Hospital, University Health Network and Division of Urology, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
3. Division of Urology, Department of Surgery and the Samuel Oschin Comprehensive Cancer Institute, Cedars Sinai Medical Center, Los Angeles, California
4. Urology Section, Veterans Affairs Medical Center, Durham, North Carolina