Funding for this research was provided by:
Postdoctoral Research Foundation of China (No. 2018M633253)
National Natural Science Foundation of China (NO. 81870737, NO. 81470760)
Received: 6 November 2018
Accepted: 1 July 2019
First Online: 11 July 2019
Ethics approval and consent to participate
: The present study was approved by the Ethics Committee of Hospital of Stomatology, Sun Yat-sen University (approval number: ERC-2018-01).
: Not applicable.
: The authors declare that they have no competing interests.