Funding for this research was provided by:
Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJCX17-0644)
Nantong city social and people's livelihood science and technology key poject (MS22019001)
The scientific research program of Jiangsu Province Health Department (H201423)
Jiangsu Province Maternal and Child Health Research Project (F201751)
Received: 24 June 2019
Accepted: 18 February 2020
First Online: 17 March 2020
Ethics approval and consent to participate
: The study protocol was approved by the Institution Review Board of The Affiliated Hospital of Nantong University. Informed consent was obtained from the parents. And the Laboratory Animal Ethics Committee of Nantong University approved the design of this study too.
: The authors declare that they have no competing interests.
: Not applicable.