Department of Urology, Seoul National University Hospital, Seoul, Korea;3. Department of Urology, Kyungpook National University School of Medicine, Daegu, Korea;4. Department of Urology, Kyung Hee University School of Medicine, Seoul, Korea;5. Department of Urology, Busan National University Yangsan Hospital, Yangsan, Korea;6. Department of Urology, College of Medicine, Busan Paik Hospital, Inje University, Busan, Korea;7. Department of Urology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea;8. Department of Urology, College of Medicine, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea;9. Department of Urology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea;10. Department of Urology, Hallym University Kangnam Sacred Heart Hospital, Hallym University School of Medicine, Seoul, Korea;11. Department of Urology, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea;12. Department of Urology, Hanyang University College of Medicine, Seoul, Korea;13. Department of Urology, Korea University College of Medicine, Seoul, Korea