1. Department of Acute Infectious Disease, Sichuan Center for Disease Control and Prevention, Chengdu City, Sichuan, P.R. China
2. Department of Arbovirus Vaccine, National Institutes for Food and Drug Control, Beijing, P.R. China
3. R&D Department, Chengdu Kanghua Biological Products Co., Ltd, Chengdu City, Sichuan, P.R. China