1. Department of Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Surgery, The Catholic University of Korea, Uijeongbu St. Mary's Hospital, Uijeongbu, Korea.
3. Seoul National University Hospital Gangnam Center, Seoul, Korea.
4. Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
5. Medical Research Collaborating Center, Seoul National University Bundang Hospital, Seongnam, Korea.
6. Department of Radiation Oncology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.