1. Graduate School of Anhui Medical University, Hefei 230032, PR China
2. State Key Laboratory of Pathogen & Biosecurity, Beijing Institute of Microbiology & Epidemiology, Beijing 100071, PR China
3. Department of Laboratorial Science and Technology, School of Public Health, Peking University, Beijing 100191, PR China
4. Beijing Key Laboratory of Toxicological Research & Risk Assessment for Food Safety, Beijing 100191, PR China
5. Department of Developmental Biology, Affiliated Bayi Children’s Hospital, PLA Army General Hospital, Beijing 100700, PR China
6. Department of Epidemiology, Tong Zhou Institute of Infectious Disease & Epidemiology, Beijing 101113, PR China