1. State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, 100071, P. R. China
2. Graduate School of Anhui Medical University, Hefei, 230032, P. R. China
3. School of Public Health, Peking University, Beijing, 100191, P. R. China
4. The 154 Hospital, People's Liberation Army, Xinyang, 464000, P. R. China
5. The Shangcheng People's Hospital, Xinyang, 464000, P. R. China
6. Shandong Provincial Center for Disease Control and Prevention, Jinan, 250001, P. R. China