Received: 22 July 2019
Accepted: 2 July 2020
First Online: 13 July 2020
Ethics approval and consent to participate
: This research project was approved by the Graduate School of Medical and Dental Science, Kagoshima University (No. 638, 180,122).All target residents received a written explanation of the study protocol and the voluntary nature of participation. Residents who consented to participate were asked to return the completed questionnaire. Informed consent was assumed to be obtained when the participants returned a completed questionnaire.MT obtained a license to use this scale in this study and that a copy of the license has been made available to the Editor of the journal.
: All target residents received a written explanation of the possible publication of the research findings. Residents who consented to participate were asked to return the completed questionnaire.
: The authors declare that they have no competing interests.