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. 2021 Aug 20;188(9):302. doi: 10.1007/s00604-021-04946-3

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© The Author(s) 2021, corrected publication 2021

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. 1 — Schemes of the two designs developed in this work: (A) design 1, which uses two straight strips and one short “T” piece for mixing, and (B) design 2, using a long “T”-shaped sampler and a straight strip for dilution. (C) Scheme (top) and picture (bottom) of the assembled microfluidic paper-based device including gold-plated headers