1. Liver Research Unit, Chang Gung Memorial Hospital, Keelung 204, Taiwan
2. Community Medicine Research Center, Chang Gung Memorial Hospital, Keelung 204, Taiwan
3. Division of Gastroenterology, Chang Gung Memorial Hospital, Keelung 204, Taiwan
4. Liver Research Unit, Linkou Chang Gung Memorial Hospital and University College of Medicine, Taoyuan 333, Taiwan