Funding for this research was provided by:
Program for Innovation Team Building at Institutions of Higher Education in Chongqing in 2016 (CXTDG201602006)
Natural Science Foundation of Chongqing, China in 2018 (cstc2018jscx-mszdX0017)
Oral Disease Prevention and New Materials, Shanxi Provincial Key Laboratory Open Project (No: KF2020-01)
Received: 18 June 2020
Accepted: 2 September 2020
First Online: 7 September 2020
Ethics approval and consent to participate
: The study was performed according to the World Medical Association’s Declaration of Helsinki, and the procedures were approved by the ethics committees of the Stomatological Hospital of the Chongqing Medical University (2019–79). The study did not involve any medical examination, surgical procedure, or collection of personal health information. Therefore, completing and returning the questionnaire was considered as provision of informed consent to participate in the study.
: Not applicable.
: None of the authors have any relevant financial relationship(s) with a commercial interest.