1. Department of Urology , , Akita , Japan
2. Akita University Graduate School of Medicine , , Akita , Japan
3. Department of Urology , , Hirosaki , Japan
4. Hirosaki University Graduate School of Medicine , , Hirosaki , Japan
5. Department of Urology , , Chiba , Japan
6. Chiba University Graduate School of Medicine , , Chiba , Japan
7. Department of Urology , , Kagawa , Japan
8. Kagawa University School of Medicine , , Kagawa , Japan
9. Department of Urology , Graduate School of Medical Sciences, , Fukuoka , Japan
10. Kyushu University , Graduate School of Medical Sciences, , Fukuoka , Japan
11. Department of Urology , , Tokyo , Japan
12. National Cancer Center Hospital , , Tokyo , Japan
13. Department of Urology , , Toyama , Japan
14. University of Toyama Faculty of Medicine , , Toyama , Japan
15. Department of Urology , , Tsukuba , Japan
16. Tsukuba University School of Medicine , , Tsukuba , Japan