1. Department of Surgery, Gachon University Gil Medical Center, Incheon, Korea.
2. Department of Surgery, Seoul National University Hospital, Seoul, Korea.
3. Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Surgery, King Faisal Hospital, Makkah, Saudi Arabia.
5. Department of Radiology, Gachon University Gil Medical Center, Incheon, Korea.