1. Department of Urology, Severance Hospital, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Urology, Gangnam Severance Hospital, Urological Science Institute, Yonsei University College of Medicine, Seoul, Korea.
3. Robot and Minimal Invasive Surgery Center, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.