1. Department of Urology, Gifu University Graduate School of Medicine, Gifu 5011194, Japan
2. Department of Urology, Japanese Red Cross Takayama Hospital, Takayama 5068550, Japan
3. Department of Urology, Chuno Kosei Hospital, Seki 5013802, Japan
4. Department of Urology, Japanese Red Cross Gifu Hospital, Gifu 5028511, Japan
5. Department of Urology, Hirosaki University Graduate School of Medicine, Hirosaki 0358562, Japan