1. Department of Urology, Pusan National University School of Medicine, Yangsan, Korea.
2. Department of Urology, Pusan National University Hospital, Busan, Korea.
3. Department of Urology, Pusan National University Yangsan Hospital, Yangsan, Korea.
4. Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Korea.