Received: 19 May 2020
Accepted: 20 August 2020
First Online: 11 September 2020
Ethics approval and consent to participate
: This study was approved by The Research Ethics Committee of Seijoh University (15OT23) and that of Ritsumeikan University (BKC-2018-084), and all participants signed informed consent.
: Not applicable.
: The authors declare that they have no competing interests.