1. Division of Laboratory Animal Monitoring, National Institutes for Food and Drug Control, Beijing, People’s Republic of China
2. China National Rodent Laboratory Animal Resources Center, Beijing, People’s Republic of China
3. Division of Diphtherria, Tetanus and Pertussis Vaccine and Toxins, National Institutes for Food and Drug Control, Beijing, People’s Republic of China
4. Key Laboratory of the Ministry of Health for Research on Quality and Standardization of Biotech Products, Beijing, People’s Republic of China