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. 2023 Mar 27;13:4977. doi: 10.1038/s41598-023-32317-w

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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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Trajectory of the number of breast cancer surgeries. (a) The total number of breast cancer surgeries. (b) The number of breast-conserving surgeries without axillary lymph node dissection. (c) The number of mastectomies without axillary lymph node dissection. (d) The number of breast-conserving surgeries with axillary lymph node dissection. (e) The number of mastectomies with axillary lymph node dissection. The numbers were calculated using medical inpatient and Diagnosis Procedure Combination insurance claims. The observed numbers during all observation periods (solid line) and the expected counterfactual numbers with 95% confidence intervals during the COVID-19 pandemic (dashed and dotted lines) were plotted. Data are represented by quarterly series, January, April, July, and October.