Funding for this research was provided by:
National Natural Science Foundation of China (81200806)
Natural Science Foundation of Beijing Municipality (7192227)
Peking University Medicine Seed Fund for Interdisciplinary Research (BMU 2018MI013)
Received: 28 February 2020
Accepted: 19 June 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: The study was reviewed and approved by the Institutional Review Board of Peking University School and Hospital of Stomatology (PKUSSIRB-201944062). 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. Written informed consent was obtained from each patient before participation in the study.
: Not applicable.
: The authors declare that they have no competing interests.