1. Division of General Internal Medicine and Geriatrics, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 333, Taiwan
2. Department of Gastroenterology and Hepatology, Chang Gung Memorial Hospital, Chiayi Branch, Chiayi 613, Taiwan
3. Department of Gastroenterology and Hepatology, Chang Gung Memorial Hospital, Keelung Branch, Keelung 204, Taiwan
4. College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
5. Department of Nephrology, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 333, Taiwan
6. Department of Gastroenterology and Hepatology, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 333, Taiwan