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This study was approved by the Institutional Review Board of Seoul National University Hospital (IRB no. 1110-111-383).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"Informed consent for participation in the study was waived by the Institutional Review Board of Seoul National University Hospital on the basis that this study was a retrospective study using archived material, and did not increase risk to the patients.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Informed consent"}}]}}