1. Department of Urology, Wakayama Medical University, 811-1 Kimiidera, Wakayama City 641-0012, Japan
2. Department of Urology, Hara Genitourinary Hospital, 5-7-17 Kitanagasadori, Chuo-ku, Kobe City 650-0012, Japan
3. Department of Urology, Kobe University, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe City 650-0017, Japan
4. Department of Urology, Konan Medical Center, 1-5-16 Kamokogahara, Higashinada-ku, Kobe City 658-0064, Japan