1. Department of Urology, Jeonbuk National University Medical School, Jeonju, Korea.
2. Research Institute of Clinical Medicine of Jeonbuk National University, Jeonju, Korea.
3. Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Korea.
4. Department of Urology, Pusan National University School of Medicine, Busan, Korea.
5. Medical Research Institute of Pusan National University Hospital, Busan, Korea.