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Article History

Received: 26 July 2020

Accepted: 28 December 2020

First Online: 14 January 2021

Ethics approval and consent to participate

: This study was approved by the Ethics Committee of Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences (No. 1706-050). Participants were given oral explanations and written documents regarding this study. All postgraduate students provided their signed consent after confirming their understanding. All SPs provided consent via e-mail.

: Toshiko Yoshida, MA, PhD, is an assistant professor at Center for Education in Medicine and Health Sciences (Dental Education), Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan.Sho Watanabe, DDS, PhD, is a clinical fellow at Comprehensive Dental Clinic, Okayama University Hospital, Okayama, Japan.Takayuki Kono, DDS, PhD, is an assistant professor at Comprehensive Dental Clinic, Okayama University Hospital, Okayama, Japan.Hiroaki Taketa, DDS, PhD, is an assistant professor at Comprehensive Dental Clinic, Okayama University Hospital, Okayama, Japan.Noriko Shiotsu, DDS, PhD, is a clinical fellow at Comprehensive Dental Clinic, Okayama University Hospital, Okayama, Japan.Hajime Shirai, DDS, PhD, is a lecturer at Comprehensive Dental Clinic, Okayama University Hospital, Okayama, Japan.Yukie Nakai, DDS, PhD, is a professor at Department of Dental Hygiene, University of Shizuoka, Junior College, Shizuoka, Japan.Yasuhiro Torii, DDS, PhD, is a professor at Comprehensive Dental Clinic, Okayama University Hospital, Okayama, Japan.

: Not applicable.

: The authors declare that they have no competing interests.