1. Department of Urology; Tokyo Medical and Dental University Graduate School; Tokyo Japan
2. Department of Urology; Tobu Chiiki Hospital; Tokyo Japan
3. Department of Urology; JA Toride Medical Center; Toride Japan
4. Department of Urology; Saitama Red Cross Hospital; Saitama Japan
5. Department of Urology; Tsuchiura Kyodo General Hospital; Tsuchiura Japan