1. Department of Urology, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.
2. Graduate School of Management and Policy, The Catholic University of Korea, Seoul, Korea.
3. Department of Urology, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
4. Department of Urology, Seoul National University Bundang Hospital, Seongnam, Korea.
5. Department of Urology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6. Department of Urology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.