Funding for this research was provided by:
Capacity Building for Sci-Tech Innovation Service-Fundamental Scientific Research Funds (SK2020PT04)
Article History
Accepted: 27 December 2021
First Online: 3 February 2022
Declarations
:
: All procedures performed involving human participants were in accordance with the ethical standards of the institutional and national research committee. All procedures for this study were approved by the Institutional Review Board of Shandong Normal University.
: Informed consent was obtained from all parents and children included in the study.
: Informed consent was obtained from all author.
: On behalf of all authors, the corresponding author states that there is no conflict of interest.