1. Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Radiation Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.