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All methods were carried out in accordance with relevant guidelines and regulations. The informed consent was waived by the same ethics committee that approved the study (the ethics committee of Nanjing Jinling Hospital) due to the retrospective nature. The patients underwent endometrial biopsy examination for medical purpose. Informed consent forms were signed by study participants.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"425"}}