Funding for this research was provided by:
the Ministry of Education Project of Key Research Institute of Humanities and Social Sciences in Universities (15JJD190003)
the TNU Funding Programme for Ph.D. Rookies (2018BSXR006)
Article History
First Online: 31 October 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from parents of all individual child participants included in the study, and verbal consent was obtained from all individual child participants included in this study.