1. Department of Urology Graduate School of Medical Sciences Kyushu University FukuokaJapan
2. Department of Urology International University of Health and Welfare Narita Hospital ChibaJapan
3. Department of Biostatistics and Clinical Epidemiology Sapporo Medical University SapporoJapan
4. Department of Urology Komatsu Municipal Hospital KomatsuJapan
5. Department of Urology Graduate School of Medicine Chiba University ChibaJapan
6. Department of Urology Graduate School of Medicine The University of Tokyo TokyoJapan
7. Research Center for Advanced Science and Technology The University of Tokyo Tokyo Japan