Funding for this research was provided by:
Peking University School and Hospital of Stomatology (PKUSSNCT-17B10)
Received: 26 December 2020
Accepted: 16 March 2021
First Online: 25 March 2021
: All procedures performed in the present study involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the declaration of Helsinki 1975, which was revised in 2000. The Ethics Committee of Peking University Stomatology Hospital approved the study protocol (PKUSSIRB-201947089). Written informed consent for participation was obtained from each subject recruited in this study.
: Not applicable.
: The authors declare that they have no competing interests.