1. Department of Medicine, Graduate School, Korea University, Seoul, Korea.
2. Department of Urology, Uijeongbu Eulji Medical Center, Eulji University School of Medicine, Uijeongbu, Korea.
3. Sports Medical Center and Sports Medicine Research Institute, Inje University Seoul Paik Hospital, Seoul, Korea.
4. Department of Urology, Kyung Hee University Medical Center, School of Medicine, Kyung Hee University, Seoul, Korea.
5. Department of Urology, Inje University Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
6. Department of Medicine, VA San Diego Health Care System, University of California, San Diego, CA, USA.