1. Department of Urologic Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
2. Center for Surgical Quality and Outcomes Research, Vanderbilt University Medical Center, Nashville, Tennessee
3. Division of Epidemiology, Vanderbilt University Medical Center, Nashville, Tennessee
4. VA Tennessee Valley Healthcare System, Nashville, Tennessee
5. Division of Clinical Pharmacology, Vanderbilt University Medical Center, Nashville, Tennessee
6. Urology Associates, Nashville, Tennessee