1. From the Department of Surgery, Division of Urologic Surgery, the Department of Pathology, and the Mallinckrodt Institute of Radiology, Washington University, St. Louis, Missouri; the Department of Surgery, Division of Urology, University of Wisconsin, Madison, Wisconsin; the Department of Urology, Chung-Ang University, Yongsan Hospital, Seoul, Korea and the Department of Surgery, Division of Urology, University of Texas Southwestern Medical Center, Dallas, Texas.