Article History
Received: 12 September 2019
Accepted: 10 February 2020
First Online: 14 March 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consents were obtained from all individual participants included in the study. Under the ethics committee of the Affiliated Second Hospital, and the ethics committee of the Affiliated Stomatology Hospital, Zhejiang University School of Medicine, China, all patients provided written informed consent. The protocols were reviewed and approved by the local institutional review boards (IRB). The IRB numbers for our medical ethic files were No. 2015 (17) of the stomatology hospital and 2010 (137) of the second hospital both affiliated to School of Medicine Zhejiang University.
: Consent for publication was obtained from all the patients.
: The authors declare that they have no conflict of interest in this work.