Received: 30 November 2020
Accepted: 17 December 2020
First Online: 9 January 2021
Ethics approval and consent to participate
: Ethical approval was sought and given by the Dankook University Dental Hospital Institutional Review Board (IRB number: DKUH IRB 2020-05-006) for carrying out this study.
: Not applicable.
: The authors declare that they have no competing interests.