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. 2019 May 2;9:6839. doi: 10.1038/s41598-019-43095-9

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© The Author(s) 2019

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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Excipient microstructure modulates acute transfer of balloon coating. Mean contact pressure was computed by normalizing the application force with the intrinsic shape of shellac (A) and urea (B). Normalized contact radius was different between shellac (C) and urea (D) as well. Asterisks indicate statistical significance (p < 0.05). (E) Net coating transfer as a function of mean contact pressure for urea and shellac. Data on both axes is plotted in log-10 scale.