1. The State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, Collaborative Innovation Center of Biologic Products, School of Public Health, Xiamen University, Xiamen, People’s Republic of China
2. Xinmi Maternal and Child Health Hospital, Xinmi, People’s Republic of China
3. Jiaxian Maternal and Child Health Hospital, Jiaxian, People’s Republic of China
4. Zhongmu Maternal and Child Health Hospital, Zhongmu, People’s Republic of China