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. 2017 Jan 11;17:25. doi: 10.1186/s12884-016-1192-5

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© The Author(s). 2017

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 — Distribution of gestational age (GA) estimated by last menstrual period (LMP), Farr examination and ultrasound measurements (US). a Distribution of GA estimated by LMP (gray) and US (black). b Distribution of GA estimated by Farr examination (white) and US (black)