1. Department of Gastroenterology and Hepatology, Linkou Chang Gung Memorial Hospital, Taoyuan, Taiwan;
2. Department of Gastroenterology and Hepatology, Mackay Memorial Hospital, Taipei, Taiwan;
3. Department of Medical Imaging and Interventions, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan, Taiwan;
4. Department of Anatomic Pathology, Linkou Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Taoyuan, Taiwan.