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Article History

Received: 7 March 2021

Accepted: 25 April 2021

First Online: 10 May 2021

Declarations

:

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.

: This study was approved by the authors’ research ethics committee (University of Miyazaki). Moreover, the authors were asked to obtain informed consent as follows: informed consent was obtained by opt-out method. Concretely, the authors noticed details of this study on their website and asked participants to offer the authors not to use their information until the specified date. After this date, the authors could use information without patients who asked us not to use.

: The authors declare that they have no conflict of interest.