1. Division of Gastroenterology and Hepatology, Department of Internal Medicine; Chang Gung Memorial Hospital; Keelung Taiwan
2. School of Medicine; Chang Gung University; Taoyuan Taiwan
3. Division of Gastroenterology, Department of Medicine; Evergreen General Hospital; Taoyuan Taiwan
4. Division of Gastroenterology and Hepatology, Department of Internal Medicine; Chang Gung Memorial Hospital; Taoyuan Taiwan
5. Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, College of Medicine; Taipei Medical University; Taipei Taiwan