1. From the Urology Service, Department of Surgery, Brooke Army Medical Center, Fort Sam Houston, Texas, Department of Urology, University of California School of Medicine and San Francisco General Hospital, San Francisco, California, Mississippi Urology Clinic, P. L. L. C., Jackson, Mississippi, Department of Urology, State University of New York, Buffalo and Section of Urology, Lenox Hill Hospital, New York, New York