1. Department of Internal Medicine, Chang Gung Memorial Hospital, Taoyuan 33353, Taiwan
2. Department of Gastroenterology and Hepatology, Chang Gung Memorial Hospital, Taoyuan 33353, Taiwan
3. College of Medicine, Chang Gung University, Taoyuan 33353, Taiwan
4. Department of Pathology, Chang Gung Memorial Hospital, Taoyuan 33353, Taiwan