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. 2019 Aug 9;9:11562. doi: 10.1038/s41598-019-47978-9

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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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The release profiles of metal ions from metallogels in PBS at pH 7.4 and 37 °C. The cumulative release concentrations of metal ions were recorded using ICP-MASS for 13 days. The data was fitted by using the Higuchi model (dash lines).