Received: 24 March 2021
Accepted: 18 July 2021
First Online: 1 October 2021
: This study was conducted after a review by the Teikyo University Ethical Review Board for Medical and Health Research Involving Human Subjects in accordance with the ethics guidelines for medical research on humans (approval number: 19–049).
: Not applicable.
: The authors declare that they have no competing interests.