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. 2013 Dec 7;13:151. doi: 10.1186/1471-2288-13-151

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Copyright © 2013 Ohuma et al.; licensee BioMed Central Ltd.

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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INTERGROWTH-21^stcrown-rump length measurements in relation to gestational age comparing the 3 approaches with Verburg. Full title: Crown-rump length (CRL) measurements in relation to gestational age for the INTERGROWTH-21^st project data for CRL from 9⁺⁰ to 13⁺⁶ weeks gestational age comparing all the 3 approaches (Panel A) and compared with Verburg (Panel B).