1. Department of Urology, Veterans Health Service Medical Center, Seoul, Republic of Korea;
2. Department of Urology, National Health Insurance Corporation Ilsan Hospital, Goyang, Republic of Korea;
3. Department of Urology, Ajou University School of Medicine, Suwon, Republic of Korea;
4. Department of Urology, Catholic University of Daegu School of Medicine, Daegu, Republic of Korea;
5. Department of Urology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Republic of Korea;
6. Department of Urology, Eulji General Hospital, Eulji University School of Medicine, Seoul, Republic of Korea