Oh S1, Ku J H2, Yun J M3, Kim D Y4, Lee J Y5, Min K S6, Son H1, Rho J7, Lee K8, Park W9, Choo M 10 1. Department of Urology, Seoul National Univeristy College of Medicine, 2. Department of Urology, Seoul Veterans Hospital, 3. Department of Urology, Daehang Hospital, 4. Department of Urology, Catholic University of Taegu Hyosung School of Medicine, 5. Department of Urology, The Catholic University of Korea College of Medicine, 6. Department of Urology, Inje University College of Medicine, 7. Department of Urology, Chosun University College of Medicine, 8. Department of Urology, SungKyunKwan University School of Medicine, 9. Department of Urology, Inha University College of Medicine, 10. Department of Urology, University of Ulsan College of Medicine