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. 2020 Feb 4;10:1789. doi: 10.1038/s41598-020-58719-8

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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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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NS vs. OMNI peaks. (A) Number of metabolite peaks detected in the NS and OMNI samples. (B) Degrees of peaks commonly detected in the samples, measured by the Jaccard index. (C) Comparison of the Jaccard index according to individual and preservation condition. (D) Spearman correlation coefficients of peak intensities between the NS and OMNI samples. (E) Average Spearman correlation of peak intensities between NS and OMNI samples according to the numbers of NS and OMNI samples where a peak was detected.