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This study was approved by the Institutional Review Board of Yamaguchi University, Japan. The ethics certificate number was #2022-014.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"This study was retrospective study. We applied opt-out method to obtain consent on this study. The opt-out method was approved by the Institutional Review Board of Yamaguchi University.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participants"}},{"value":"The authors have no relevant financial or non-financial interests to disclose.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}]}}