1. Department of Urology, Wakayama Medical University , 811-1 Kimiidera, Wakayama 641-0012 , Japan
2. Department of Urology, Kinan Hospital , 46-70 Shinjyo, Tanabe, Wakayama 646-8588 , Japan
3. Department of Urology, Rinku General Medical Center , 2-23 Rinkuoraikita, Izumisano, Osaka 598-8577 , Japan
4. Department of Urology, Kishiwada Tokushukai Hospital , 4-27-1 Kamori cho, Kishiwada, Osaka 596-0042 , Japan
5. Department of Urology, Wakayama Rosai Hospital , 93-1 Kinomoto, Wakayama 640-8505 , Japan