Article History
First Online: 20 August 2020
Compliance with Ethical Standards
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and/or national research committee, and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: The authors declare that they have no conflicts of interest.
: Approval for this study was granted by the Research Ethics Committee of The Nippon Dental University School of Life Dentistry at Niigata (Approval No. ECNG-E-3).
: Informed consent was obtained from all individual participants included in this study. All students and faculty who participated in this study signaled their agreement to participate on a consent form. Participation was voluntary, and only data from consenting students were used in the analyses.