1. Department of Epidemiology and Statistics; Public Health School; Tongji Medical College; Huazhong University of Science and Technology; Wuhan China
2. Division of Infectious Diseases; Key Laboratory of Surveillance and Early-warning on Infectious Disease; Chinese Center for Disease Control and Prevention; Beijing China
3. Fogarty International Center; National Institutes of Health; Bethesda MD USA
4. Influenza Division; National Center for Immunization and Respiratory Diseases; Centers for Disease Control and Prevention; Atlanta GA USA
5. National Center for Chronic and Noncommunicable Disease Control and Prevention; Chinese Center for Disease Control and Prevention; Beijing China
6. National Center for Chronic Disease Prevention and Health Promotion; Centers for Disease Control and Prevention; Atlanta GA USA
7. Center for Public Health Surveillance and Information Service; Chinese Center for Disease Control and Prevention; Beijing China