Funding for this research was provided by:
National Natural Science Foundation of China (31971247)
Science and Technology Department of Sichuan Province (2018SZ0379)
Received: 15 September 2019
Accepted: 30 March 2020
First Online: 15 April 2020
Ethics approval and consent to participate
: Ethical approval for the study was obtained from the Ethics Committee of the West China Hospital of Stomatology, Sichuan University (WCHSIRB-ST-2017-131). Written informed consent was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.