Received: 10 May 2021
Accepted: 14 October 2021
First Online: 6 November 2021
: All procedures performed in this study were conducted in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. This study was approved by the Ethics Committee of Kagawa University. The requirement for obtaining informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.