1. Department of Urology; School of Medicine; International University of Health and Welfare; Chiba Japan
2. Research Center for Advanced Science and Technology; University of Tokyo; Tokyo Japan
3. Department of Biostatistics and Clinical Epidemiology; Sapporo Medical University; Sapporo Japan
4. Department of Urology; School of Medicine; Keio University; Tokyo Japan
5. Department of Urology; Kyoto University Graduate School of Medicine; Kyoto Japan
6. Department of Urology; Shinsui Clinic; Tokyo Japan
7. Department of Urology; Gunma University Graduate School of Medicine; Gunma Japan
8. Department of Urology; Harasanshin Hospital; Fukuoka Japan
9. Department of Urology; Hasegawa Hospital; Toyama Japan
10. Department of Urology; Osaka International Cancer Institute; Osaka Japan
11. Department of Urology; Osaka Gyoumeikan Hospital; Osaka Japan
12. Department of Urology; Sapporo Medical University; Sapporo Japan