1. Division of Gastroenterology and Hepatology, Department of Internal Medicine New Taipei Municipal TuCheng Hospital New Taipei City Taiwan
2. Division of Gastroenterology and Hepatology Department of Internal Medicine, Linkou Chang Gung Memorial Hospital Taoyuan Taiwan
3. College of Medicine, Chang Gung University Taoyuan Taiwan
4. Graduate Institute of Clinical Medicine, College of Medicine, Chang Gung University Taoyuan Taiwan