1. Department of Urology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. College of Medicine, Seoul National University, Seoul, Korea.
3. Department of Urology, Pusan National University Yangsan Hospital, Yangsan, Korea.
4. Department of Urology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.
5. Department of Urology, SMG-SNU Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea.