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Article History

Received: 29 September 2020

Accepted: 24 February 2021

First Online: 6 March 2021

Declarations

:

: All experimental procedures performed in this study involving human participants were completed in accordance with the ethical standards of the institutional and/or national research committee with the 1964 declaration of Helsinki and its later amendments or comparable ethical standards. The study protocol was approved by the Institutional Review Board of the Kansai Medical University Hospital (Approval #2019041). Informed consent was obtained from patients using the opt-out methodology owing to the retrospective design of the study, with no risk for the participants. Information regarding this study, such as the inclusion criteria and opportunity to opt out, was provided through the institutional website.

: Not applicable.

: The authors declare no conflict of interest.