1. Division of Respiratory Virus Vaccines, National Institutes for Food and Drug Control, Beijing, People’s Republic of China
2. Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming, People’s Republic of China
3. Changchun Institute of Biological Products, Changchun, China
4. Sinovac Life Sciences Co., Ltd., Beijing, China
5. Department of R&D, Beijing Yunling Biotechnology Co., Ltd., Beijing, China