Funding for this research was provided by:
National Natural Science Foundation of China (81500842)
the Undergraduate Innovation and Training Program of Sichuan University (C2018101597, C2018103495)
Article History
Received: 7 August 2018
Accepted: 18 January 2019
First Online: 29 January 2019
Authors’ information
: Not applicable.
: All participants volunteered for the study, were informed about the scope of the study, and provided written consent. The study was approved by the ethics committee of West China School of Stomatology, Sichuan University (Reference: WCHSIBR-OT-2016-179).
: Not applicable.
: The authors declare that they have no competing interests.
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