Tai-Chung Tseng1, Jia-Horng Kao2. 1. Department of Internal Medicine, National Taiwan University Hospital Jinshan Branch, New Taipei City, Taiwan; Hepatitis Research Center, National Taiwan University Hospital, Taipei, Taiwan. 2. Division of Gastroenterology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan; Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan; Hepatitis Research Center, National Taiwan University Hospital, Taipei, Taiwan; Department of Medical Research, National Taiwan University Hospital, Taipei, Taiwan. Electronic address: kaojh@ntu.edu.tw.