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Authors
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (81671034)
National Key R&D Program of China (2018 YFC0807303)
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Article History
Received: 17 January 2020
Accepted: 7 May 2020
First Online: 18 May 2020
Compliance with ethical standards
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: The authors declare that they have no conflict of interest.
: 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. The study was approved by the Institutional Review Board of Peking University School and Hospital of Stomatology (PKUSSIRB-201944052).
: Informed consent was obtained from all individual participants included in this study. They received oral and written information about the design of the study and their right to withdraw at any time without negative effect on their treatment.
