1. Department of Urology, Teikyo University School of Medicine, Itabashi, Tokyo, Japan
2. Department of Urology, Graduate School of Medicine, The University of Tokyo, Bunkyo, Tokyo, Japan
3. Department of Urology, Tokyo Teishin Hospital, Chiyoda, Tokyo, Japan
4. Department of Urology, Musashino Red Cross Hospital, Musashino, Tokyo, Japan
5. Department of Urology, Mitsui Memorial Hospital, Chiyoda, Tokyo, Japan
6. Department of Urology, The Fraternity Memorial Hospital, Sumida, Tokyo, Japan
7. Department of Urology, Kyorin University School of Medicine, Mitaka, Tokyo, Japan
8. Department of Urology, Japan Organization of Occupational Health and Safety Kanto Rosai Hospital, Kawasaki Kanagawa, Japan
9. Department of Urology, Yaizu City Hospital, Yaizu, Shizuoka, Japan
10. Department of Urology, Center Hospital of the National Center for Global Health and Medicine, Shinjuku, Tokyo, Japan
11. Department of Urology, Tokyo Metropolitan Bokutoh Hospital, Sumida, Tokyo, Japan