Academy of Military Sciences - Beijing Institute of Microbiology and Epidemiology, Beijing Normal University (BNU) - School of Mathematical Sciences, Academy of Military Sciences - Beijing Institute of Microbiology and Epidemiology, Peking University, School of Public Health, Department of Laboratorial Science and Technology, Southern Medical University - First School of Clinical Medicine, Jinan Center for Disease Control and Prevention, Shandong University, Beijing Institute of Microbiology and Epidemiology - State Key Laboratory of Pathogen and Biosecurity, Academy of Military Sciences - State Key Laboratory of Pathogen and Biosecurity, Government of the People's Republic of China - Department of Combined TCM and Western Medicine, Academy of Military Sciences - Beijing Institute of Microbiology and Epidemiology, University of Florida - Department of Biostatistics and Academy of Military Sciences - Beijing Institute of Microbiology and Epidemiology