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The study was approved by the institutional review boards of all participating centers: the Ethics Committee of Xuzhou Central Hospital, Southeast University; the Ethics Committee of The Third Affiliated Hospital of Soochow University, Changzhou First People\u2019s Hospital; the Ethics Committee of The Affiliated Hospital of Xuzhou Medical University; the Ethics Committee of Jinan Maternal and Child Health Care Hospital; and the Ethics Committee of The People\u2019s Hospital of Sishui. The requirement for informed consent was waived due to the retrospective nature of the study.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval and consent to participate"}}],"article-number":"11728"}}