1. Department of Urology, Akita University School of Medicine, Akita
2. Department of Urology, Hirosaki University School of Medicine, Hirosaki
3. Department of Urology, Tohoku University School of Medicine, Tohoku
4. Department of Urology, Kesen-numa City Hospital, Kesen-numa
5. Department of Urology, Akita City Hospital, Akita
6. Department of Urology, Sendai City Hospital, Sendai
7. Department of Urology, Yamagata Prefectural Central Hospital, Michinoku Japan Urological Cancer Study Group (MJUCSG), Yamagata, Japan