1. Department of Microbiology, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China
2. Institute of Liver Diseases, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
3. Institute of Infection and Immunity, Taihe Hospital, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
4. Hospital of Chengdu Office of People's Government of Tibetan Autonomous Region, Chengdu, Sichuan 610041, P.R. China