Received: 18 May 2020
Accepted: 9 November 2020
First Online: 19 November 2020
Ethics approval and consent to participate
: The ethics committee at Hokkaido University Faculty of Health Sciences approved the present study (approval no.19-68). The participants received an explanation of aims and experimental methods, including the right to withdraw from the study at any point without prejudice and insurance that anonymity would be protected throughout all components of the study. All participants provided informed consent before participating in this experiment.
: We obtained the consent for publication from our participants by oral explanation and a document. Informed consent to participate in our study included this process.
: The authors declare that they have no competing interests.