Zhang, Heng
Li, Zhijuan
Wei, Yarong
Fu, Jinyan
Feng, Yaling
Chen, Daozhen
Xu, Dexiang
Funding for this research was provided by:
National Natural Science Foundation of China (81502813)
Major scientific research project of Wuxi Municipal Health Commission (Z201902)
Maternal and Child Health Research Key Project of Jiangsu Province (F201601)
Jiangsu Maternal and Child Health Youth Talents Project (FRC201783)
Wuxi Kejiao Qiang Wei Key Medical Talent Project (ZDRC010)
Wuxi Health Planning Commission of Maternal and child health Appropriate Technical Projects Fund (FYTG201736)
Article History
Received: 10 November 2019
Accepted: 19 March 2020
First Online: 1 April 2020
Ethics approval and consent to participate
: All participants’ parents or guardians consented in writing to their children’s participation, and the above protocols were approved by the ethics committee of Wuxi Maternal and Child Health Hospital.
: Not applicable.
: The authors declare that they have no competing interests.