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. 2023 Mar 1;13:3444. doi: 10.1038/s41598-023-30591-2

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Flow chart of sample selection for the current endometrial microbiota study. RCT, randomised controlled trial. ^aEndometrial biopsies were obtained from women undergoing endometrial scratching in the SCRaTCH trial, a randomised controlled trial on endometrial scratching in women with a first failed IVF/ICSI cycle¹⁹.