Funding for this research was provided by:
Fujian Provincial Maternity and Children Hospital (YCXM 19-29;YCXZ 18-04)
Received: 22 October 2020
Accepted: 23 February 2021
First Online: 4 March 2021
: This study was approved by the ethics committee of Fujian Provincial Maternity and Children Hospital.(YCXM2019–105).
: All authors provided final approval of the version to be published and agree to be accountable for all aspects of the work in ensuring that questions.
: The authors declare that they have no competing interests.