1. Department of Microbiology and Infectious Disease Center, School of Basic Medical Sciences, Beijing, China
2. Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
3. Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Centre, Beijing, China
4. Guangxi Key Laboratory of the Prevention and Control of Viral Hepatitis, Guangxi Zhuang Autonomous Region Center for Disease Prevention and Control, Nanning, Guangxi, China