1. Department of Urology, Chungbuk National University College of Medicine, Cheongju, Korea.
2. Department of Urology, Gangnam Severance Hospital, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Urology, Kyungpook National University School of Medicine, Daegu, Korea.
4. Department of Urology, Seoul National University Bundang Hospital, Seongnam, Korea.
5. Department of Urology, Gyeongsang National University School of Medicine, Jinju, Korea.