1. Division of Gastroenterology, Department of Internal Medicine, Dankook University College of Medicine, Cheonan, South Korea
2. Department of Gastroenterology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea
3. Department of Hepato-biliary and Pancreatic Surgery, University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea
4. Department of Radiation Oncology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea
5. Department of Oncology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea
6. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea