Funding for this research was provided by:
Japan Society for the Promotion of Science (19K10429)
Received: 13 July 2020
Accepted: 8 November 2020
First Online: 18 November 2020
Ethics approval and consent to participate
: Written informed consent was obtained from all participants. This study was approved by the Ethics Committee of Japanese Association for Dental Science, Tokyo, Japan (Approval No. 0002).
: Not applicable.
: JA is an associate editor for BMC Oral Health. Other than that, the authors state that they have no financial or nonfinancial conflict of interest.