Fudan University, Fudan University, Chinese Center for Disease Control and Prevention (China CDC) - Shanghai Municipal Center for Disease Control and Prevention, Chinese Center for Disease Control and Prevention (China CDC) - Shanghai Municipal Center for Disease Control and Prevention, Chinese Center for Disease Control and Prevention (China CDC) - Shanghai Municipal Center for Disease Control and Prevention, Fudan University - School of Public Health, Chinese Center for Disease Control and Prevention (China CDC) - Shanghai Municipal Center for Disease Control and Prevention, Chinese Center for Disease Control and Prevention (China CDC) - Shanghai Municipal Center for Disease Control and Prevention, Chinese Center for Disease Control and Prevention (China CDC) - Shanghai Municipal Center for Disease Control and Prevention, Chinese Center for Disease Control and Prevention (China CDC) - Shanghai Municipal Center for Disease Control and Prevention, Chinese Center for Disease Control and Prevention (China CDC) - Shanghai Municipal Center for Disease Control and Prevention and Fudan University - Shanghai Institute of Infectious Disease and Biosecurity