1. Expanded Program on Immunization, Chongqing Center for Disease Control and Prevention, Chongqing, People’s Republic of China
2. Beijing Institute of Biotechnology, Academy of Military Medical Sciences, Beijing, People’s Republic of China
3. Logistics University of Chinese People’s Armed Police Force, Tianjin, People’s Republic of China
4. CanSino Biologics Inc., Tianjin, People’s Republic of China
5. Expanded Program on Immunization, Yubei District Center for Disease Control and Prevention, Chongqing, People’s Republic of China