1 Department of Urology, Jeonbuk National University Medical School, and Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Korea.
2 Department of Urology, Donga University College of Medicine, Donga University Hospital, Busan, Korea.
3 Department of Urology, Gyeongsang National University College of Medicine, and lnstitute of Health Sciences of Gyeongsang National University, Jinju, Korea.
4 Department of Urology, Gyeongsang National University Changwon Hospital, Changwon, Korea.