1. Department of Urology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 2-5-1, Shikata-cho, Kita-ku, Okayama 700-8558, Japan
2. Koichiro Wada Department of Urology, School of Medicine, Shimane University, 89-1, Enya-cho, Izumo 693-8501, Japan