1. School of Public Health, Fudan University, Shanghai 200032, China
2. Shenzhen Key Laboratory of Pathogen and Immunity, National Clinical Research Center for Infectious Disease, Shenzhen Third People's Hospital, Shenzhen, Guangdong 518100, China
3. Department of Infection and Immunity, Shanghai Public Health Clinical Center, Fudan University, Shanghai 201508, China
4. Songjiang District Center for Disease Control and Prevention, Shanghai 201620, China.