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. 2021 Mar 18;11:6388. doi: 10.1038/s41598-021-85852-9

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© The Author(s) 2021

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 showing the search strategy and inclusion/exclusion criteria for the study population. AEC: absolute eosinophil count; CEREO: French national reference center for hyper-eosinophilic syndromes; INNOVTE: investigation network on venous thromboembolism; VT: venous thrombosis. *post-operative period, estrogen-based oral contraceptive therapy started within the previous six months, post-partum period; antiphospholipid syndrome, nephrotic syndrome, retinal vein occlusion, superficial venous thrombosis (a single patient each).