Funding for this research was provided by:
Fujian Provincial Department of Science and Technology (grant No.YCXB 18-05 and No.YCXM 19-03)
the Natural Science Foundation of Fujian Province, China (2014J01278)
Article History
Received: 30 June 2020
Accepted: 20 August 2021
First Online: 14 September 2021
Declarations
:
: This study was approved by the Ethics Committee of the Fujian Maternity and Child Health Hospital and conformed to the principles of the Declaration of Helsinki. Written informed consent was obtained from each parent or legal guardian after reading the consent document and addressing their queries. All proper institutional review board approvals were obtained for this study.
: Not applicable.
: The authors declare that they have no competing interests.