1. Department of Urologic Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
2. Division of Urologic Surgery, Washington University School of Medicine, St. Louis, Missouri
3. Department of Urologic Surgery, University of Southern California, Los Angeles, California
4. Department of Urology, Indiana University, Indianapolis, Indiana
5. Division of Urologic Surgery, Washington University School of Medicine, St. Louis, Missouri; Mallinckrodt Institute of Radiology, Washington University Medical School, St. Louis, Missouri