1. Department of Public Health of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, China
2. Guangxi Zhuang Autonomous Region Center for Disease Prevention and Control, Guangxi Key Laboratory for the Prevention and Control of Viral Hepatitis, Nanning, Guangxi 530028, China
3. Division of Medicine, UCL Medical School, London, UK
4. School of Preclinical Medicine, Guangxi Medical University, Nanning, Guangxi 530021, China