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. 2019 Apr 23;411(24):6309–6317. doi: 10.1007/s00216-019-01790-6

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© The Author(s) 2019

Open Access This 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.

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Fig. 4 — PCA plots of urine samples analysed by HILIC-FAIMS-MS at a CF of 0.39 Td, containing fresh (blue), aged (green), and quality control samples (orange)