1. Department of Hepatology, The Sixth People's Hospital of Qingdao, Qingdao, Shandong 266033, P.R. China
2. Department of Digestive Diseases, The Sixth People's Hospital of Qingdao, Qingdao, Shandong 266033, P.R. China
3. Department of Infectious Diseases, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China