1. Department of Urology, Gangnam Severance Hospital, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Urology, Severance Hospital, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Urology, Institute of Evidence Based Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.