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. 2019 May 20;26:38. doi: 10.1186/s12929-019-0530-0

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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.

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Fig. 2 — Flowchart summarizing the total numbers of patients and assessments in each trimester, obtained from the observational study between 2011 and 2016 as part of the Hasselt University Research Project of Maternal Venous Hemodynamics. The grey zones are the patients included in this analysis. T1: trimester 1; T2: trimester 2; T3: trimester 3; GH: Gestational hypertension; LPE: Late preeclampsia; EPE: Early preeclampsia; EH: Essential hypertension; SGA: Small for gestational age