1. Department of Urology, Kobe University School of Medicine, Kobe 650-0017, Japan.
2. Tokushima Research Institute, Otsuka Pharmaceutical Co., Ltd., Tokushima 771-0192, Japan.
3. Department of Urology, Akashi Municipal Hospital, Akashi 673-8501, Japan.
4. Department of Urology, Takasago Municipal Hospital, Takasago 676-0015, Japan.
5. Department of Urology, Sumiyoshigawa Hospital, Kobe 658-0084, Japan.