1. Department of Digestive Diseases, The Sixth People's Hospital of Qingdao, Qingdao, Shandong 266033, P.R. China
2. Department of Hepatology, The Sixth People's Hospital of Qingdao, Qingdao, Shandong 266033, P.R. China
3. Department of Infectious Diseases, The First Affiliated Hospital of Xinxiang Medical University, Weihui, Henan 453100, P.R. China