1. NHC Key Lab of Reproduction Regulation (Shanghai Institute for Biomedical & Pharmaceutical Technologies), Fudan University, Shanghai, China
2. Chongqing Health Center for Women & Children, Chongqing, China
3. Fujian Maternity & Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fujian, China
4. NHC Key Laboratory of Birth Defects Prevention, Henan Institute of Reproduction Health Science & Technology, Zhengzhou, Henan, China
5. Maternal & Child Health & Family Planning Service Center of Huixian City, Henan, China