1. a Departments of Surgery, Chang Gung University College of Medicine, Taoyuan, Taiwan
2. b Departments of Pathology, Chang Gung University College of Medicine, Taoyuan, Taiwan
3. c Departments of Radiology, Chang Gung University College of Medicine, Taoyuan, Taiwan
4. d Departments of Gastroenterology, Chang Gung Memorial Hospital at Linkou, Chang Gung University College of Medicine, Taoyuan, Taiwan