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. 2020 Apr 1;10:5770. doi: 10.1038/s41598-020-62404-1

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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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Chips with different resolutions have been developed. The array size was kept constant at 16 × 10 mm but the diameter of the cavities was varied. The chip with the lower resolution (a) contains 1188 cavities with a diameter of 300 μm. Our standard chip (b) is composed of 4104 cavities with a diameter of 150 μm each. Finally, the chip with the higher resolution (c) contains 31672 cavities with a diameter of 50 μm per cavity.