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. 2022 Feb 23;20:17. doi: 10.1186/s12969-022-00677-8

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© The Author(s) 2022

Open AccessThis 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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Trend in antiphospholipid antibody levels over time. A, Anticardiolipin IgG over time. B, Levels of anti-β2-glycoprotein I IgG over time. C, Anticardiolipin IgM over time. D, Anti-β2-glycoprotein I IgM over time. In all panels, the dotted horizontal line represents the level above which the result was identified as positive. To be included in this figure, a patient needed durability of an antiphospholipid antibody across at least 12 weeks apart