1. Department of Urologic Surgery; Vanderbilt University; Nashville Tennessee
2. Center for Surgical Quality and Outcomes Research; Vanderbilt University; Nashville Tennessee
3. Division of Urologic Surgery; Washington University; St. Louis Missouri
4. Division of Cancer Epidemiology and Genetics; National Cancer Institute; Bethesda Maryland
5. Tennessee Valley Veterans Administration Health System; Nashville Tennessee
6. Division of Epidemiology; Vanderbilt University; Nashville Tennessee
7. Division of Urology; University of Colorado; Aurora Colorado