Received: 10 September 2020
Accepted: 1 January 2021
First Online: 9 January 2021
Ethics approval and consent to participate
: 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 institutional review board of our institution approved the study (Tottori university, number 18A154). The informed consent requirement was waived.
: Not applicable.
: The authors declare that they have no competing interests.