1. Department of Gastroenterology and Hepatology, New Taipei Municipal TuCheng Hospital, Tucheng, New Taipei City 236, Taiwan
2. Division of Hepatology, Department of Gastroenterology and Hepatology, Linkou Chang-Gung Memorial Hospital, Taoyuan 333, Taiwan
3. College of Medicine, Chang-Gung University, Taoyuan 333, Taiwan