Funding for this research was provided by:
National Natural Science Foundation of China (61503264)
Article History
Received: 23 November 2019
Accepted: 16 May 2020
First Online: 27 May 2020
Ethics approval and consent to participate
: The study is approved by the West China Hospital of Stomatology Institutional Review Board (WCHSIRB-CT-2013-011).
: Not applicable.
: The authors declare that they have no competing interests.