1. Department of Surgery, Division of Urologic Surgery, Washington University School of Medicine, St. Louis, Missouri
2. Department of Pathology, University of Iowa Hospitals, Iowa City, Iowa
3. Medical Director, Bostwick Laboratories, Richmond, Virginia
4. Department of Surgery, Division of Urologic Surgery, and Department of Radiology (Mallinckrodt Institute of Radiology), Washington University School of Medicine, St. Louis, Missouri