1. Department of Urology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
2. Department of Urology, Faculty of Medicine, Miyazaki University, Miyazaki, Japan.
3. Department of Urology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
4. Department of Urology, Hitachi General Hospital, Hitachi, Japan.
5. Department of Urology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
6. Japan Bioassay Research Center, Iwaki, Japan.