Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (31920150006)
National Natural Science Foundation of China (11472119, 81660189)
Key laboratory of oral disease research of gansu province open project (SZD2018)
Article History
Received: 3 September 2019
Accepted: 24 January 2020
First Online: 5 February 2020
Ethics approval and consent to participate
: The Bioethical Committee of Northwest Minzu University approved the use of the samples for this research.
: Not applicable.
: The authors declare that they have no competing interests.