1. Department of UrologyYamagata University Faculty of Medicine Yamagata, Yamagata Prefecture Japan
2. Department of UrologyYonezawa City Hospital Yonezawa, Yamagata Prefecture Japan
3. Department of UrologyOkitama Public General Hospital Kawanishi town, Yamagata Prefecture Japan
4. Ishigooka Clinic Yamagata, Yamagata Prefecture Japan