Funding for this research was provided by:
National Natural Science Foundation of China (81670957, 81772876, 81700938)
Beijing Municipal Natural Science Foundation (7172239)
the sponsored by the Fund for Fostering Young Scholars of Peking University Health Science Center (BMU2018PY022)
Received: 28 May 2018
Revised: 3 August 2018
Accepted: 8 August 2018
First Online: 31 August 2018
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Peking University School of Stomatology (PKUSSIRB-201837096).
: Not applicable.
: The authors declare that they have no competing interests.
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