1. Research Center Hospital for Charged Particle TherapyNational Institute of Radiological SciencesChiba Japan
2. Department of Radiation Oncology, Graduate School of MedicineTsukuba University Faculty of MedicineIbaraki Japan
3. Kanagawa Cancer CenterYokohama Japan
4. Department of UrologyJapan Community Health Care Organization Tokyo Shinjuku Medical CenterTokyo Japan
5. Department of UrologyToho University Sakura Medical CenterChiba Japan
6. Department of Urology, Graduate School of MedicineChiba UniversityChiba Japan
7. Department of Public HealthDokkyo Medical University School of MedicineTochigi Japan