1. From the Departments of Urology and Oral and Maxillofacial Surgery, Naval Medical Center, San Diego, San Diego, California, Department of Surgery, Urology Service, Madigan Army Medical Center, Tacoma, Washington, Department of Surgery, Urology Service, Brooke Army Medical Center, San Antonio, Texas, and Department of Surgery, Urology Service, Walter Reed Army Medical Center, Washington, D.C.