1. Department of Family Medicine, Korea Cancer Center Hospital, Seoul, Korea.
2. Department of Urology, SMG-SNU Boramae Medical Center, Seoul, Korea.
3. Department of Urology, Inje University Ilsan Paik Hospital, Goyang, Korea.
4. Department of Urology, Konkuk University School of Medicine, Chungju, Korea.
5. Department of Urology, San Diego VA Health Care System & University of California, San Diego, CA, USA.