Funding for this research was provided by:
National Natural Science Foundation of China (31771237)
Fundamental Research Funds for the Central Universities (SWU1709106, SWU1809355)
Article History
First Online: 11 February 2020
Compliance with Ethical Standards
: All procedures were in accordance with the ethical standards of the institutional and national research committee.
: The authors declare that they have no conflict of interest.
: All ethical guidelines for human subjects’ research were followed.
: All participants and their parents/legal guardians provided written informed consents to participate in the study.