1 State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, China.
2 Department of Disease Control, Jining Center for Disease Control and Prevention, Jining, China.
3 Department of Disease Control, the Affiliated Wuxi Center for Disease Control and Prevention of Nanjing Medical University, Wuxi Center for Disease Control and Prevention, Wuxi, China.
4 Department of Disease Control, Jiangyin Center for Disease Control and Prevention, Jiangyin, Wuxi, China.