Funding for this research was provided by:
the national social science fund of china (20CSH068)
Article History
Accepted: 6 July 2021
First Online: 28 July 2021
Declarations
:
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by the Research Ethics Committee of Nanjing Normal University and the Department of Education of the Funing County, Jiangsu.
: Informed consent was obtained from all enrolled participants included in the study.
: All authors declare that they have no competing interests.