Received: 25 January 2021
Accepted: 23 March 2021
First Online: 31 March 2021
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional review board of ethics committee and national research committee with the 1964 Helsinki declaration and its later amendments. The Tottori University Hospital Ethics Committee approved this study (No. 17A135), and the need for informed consent was waived by the Tottori University Hospital Ethics Committee.
: Not applicable.
: The authors declare that they have no competing interests.