1. Shenzhen Kangtai Biological Products Co., Ltd., Shenzhen, Guangdong, China
2. NHC Key Laboratory of Biosafety, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
3. Beijing Minhai Biotechnology Co., Ltd., Beijing, China
4. Hunan Provincial Center for Disease Control and Prevention, Changsha, Hunan, China
5. Xiangtan County for Disease Control and Prevention, Xiangtan, Hunan, China
6. National Institutes for Food and Drug Control, Beijing, China.