Funding for this research was provided by:
National Outstanding Youth Science Fund Project of National Natural Science Foundation of China (81771223, 81770526)
Fundamental Research Funds for the Key Research Program of Chongqing Science and Technology Commission (cstc2018jscx-msybX0106)
Guangdong Key Laboratory of Fuel Cell Technology (2018B030335001)
Guangdong Provincial Key Laboratory of Reproductive Medicine (202007030002)
Received: 26 July 2020
Accepted: 8 June 2021
First Online: 3 July 2021
Change Date: 3 December 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/S12887-021-03000-8
: The research protocol was approved by the Institutional Review Board of the Children’s Hospital, Chongqing Medical University. All parents or guardians of the children who participated in the study signed written informed consent, and participation in this research was voluntary.
: Not applicable.
: The authors declare that they have no competing interests.