1. Department of Gastroenterology and Hepatology; Chang Gung Memorial Hospital and Chang Gung University College of Medicine; Taoyuan Taiwan
2. Deparment of Pathology; Chang Gung Memorial Hospital and Chang Gung University College of Medicine; Taoyuan Taiwan
3. Division of Gastroenterology, Department of Internal Medicine; Mackay Memorial Hospital and Department of Medicine, Mackay Medical College; Tokyo Japan
4. Department of Gastroenterology; NTT Medical Center Tokyo; Tokyo Japan