1 Academy of Military Medical Sciences, Academy of Military Science of Chinese PLA, Beijing, China.
2 Department of Infectious Disease Prevention and Control, Center for Disease Control and Prevention of Chinese People's Liberation Army, Beijing, China.
3 Department of Information Management, Peking University, Beijing, China.
4 Academy of Military Medical Sciences, Academy of Military Science of Chinese PLA, Beijing, China. Electronic address: zhengtao_66@163.com.
5 Department of Infectious Disease Prevention and Control, Center for Disease Control and Prevention of Chinese People's Liberation Army, Beijing, China. Electronic address: hongbinsong@263.net.
6 Department of Infectious Disease Prevention and Control, Center for Disease Control and Prevention of Chinese People's Liberation Army, Beijing, China. Electronic address: wangligui1983@126.com.