1. From the Departments of Urology, Kyorin University School of Medicine and Keio University School of Medicine, Tokyo, Niigata University School of Medicine, Niigata, Hamamatsu University School of Medicine, Hamamatsu, Komaki Shimin Hospital, Komaki, Nagoya University School of Medicine, Nagoya, Kansai Medical School, Osaka and Kyoto University School of Medicine, Kyoto, Japan.