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. 2020 Jul 1;22(4):89. doi: 10.1208/s12248-020-00473-w

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© The Author(s) 2020

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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Fig. 2 — A plot of the relative percentage versus the sample number in the private laboratory samples. The relative percentages are from each value being divided by the highest value reported in the set by the private laboratory for NDMA (or zero where no amount was detected). Similarly, the relative amount of DMF in these samples (from FDA measurements) was plotted for the same samples. The results have a coefficient of determination of 0.81