1. Institute of Epidemiology and Preventive Medicine, College of Public Health; National Taiwan University; Taipei Taiwan
2. Department of Gastroenterology, Ren-Ai Branch; Taipei City Hospital; Taipei Taiwan
3. Division of Gastroenterology, Department of Internal Medicine, National Taiwan University Hospital and Graduate Institute of Clinical Medicine; National Taiwan University College of Medicine; Taipei Taiwan
4. Liver Research Unit, Chang Gung Memorial Hospital; Chang Gung University College of Medicine; Taoyuan Taiwan