1. Department of Nephro-urology, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan
2. Department of Urology, Nagoya Tokushukai General Hospital, Kasugai, Aichi 487-0016, Japan
3. Department of Urology, Kainan Hospital, Yatomi, Aichi 498-0017, Japan