1 Institute of Disease Control and Prevention, Academy of Military Medical Science, Beijing, China.
2 Clinical Diagnostic Center, 302 Hospital of PLA, 100 Xi-Si-Huan-Zhong-Lu Street, Fengtai District, Beijing 100039, China.
3 The Center for Health Information of People's Liberation Army, Beijing, China.
4 State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Beijing, China. Electronic address: lizhenjun@icdc.cn.
5 Institute of Disease Control and Prevention, Academy of Military Medical Science, Beijing, China. Electronic address: hongbinsong@263.net.