Best pre-ductal PaO₂ prior to extracorporeal membrane oxygenation as predictor of mortality in patients with congenital diaphragmatic hernia: a retrospective analysis of a Japanese database.

"Declarations Conflict of interestsThe authors have no relevant financial or non-financial interests to disclose. Ethics approvalThis study was approved by the Ethics Committee of Chiba University Hospital (approval number 509). The study was performed in accordance with the principles of the Declaration of Helsinki and the ethical guidelines for medical and health research involving human subjects. Informed consentThe requirement for signed informed consent was waived because of the retrospective study design and the use of de-identified data. Details of the study were published on an institutional website, and individuals had the right to decline participation. Conflict of interests The authors have no relevant financial or non-financial interests to disclose."

"Funding This work was supported by a grant from the Ministry of Health, Labour, and Welfare of Japan (Grant no. 20FC1017)."