Funding for this research was provided by:
Youth Science Foundation of Jiangxi Province (20202BABL216010)
Natural Science Foundation of Jiangxi Province (20192BBG70003)
Postdoctoral Research Foundation of China (2018M642594)
Received: 7 December 2020
Accepted: 27 January 2021
First Online: 5 February 2021
Ethics approval and consent to participate
: The present study followed the tenets of the Helsinki Declaration, ethics approval was approved by the Institutional Review Board of Jiangxi Provincial Maternal and Child Health Hospital in China, and each participating woman gave informed consent.
: Not applicable.
: The authors have declared that no potential conflicts of interest exist.