Received: 18 November 2020
Accepted: 14 April 2021
First Online: 23 April 2021
: Written consent was obtained from the subjects before they completed the self-report questionnaires. The ethics committee at the University of Tsukuba Medical System approved this study (N1307) and research was carried out in accordance with the Declaration of Helsinki, taking into consideration local regulations and standards.
: Not applicable.
: The authors declare they have no conflict of interest with respect to this research study and paper. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.