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. 2019 Apr 23;9:6444. doi: 10.1038/s41598-019-42910-7

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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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Prototype testing in in vitro conditions. (a) Schematic rendering of the in vitro set-up designed to test the long-term stability of the electrical output of the micro-stimulators after exposure to a saline solution. (b) A representative trace of a voltage reading from a micro-stimulator which successfully maintained a consistent electrical output for 1 month. (c) Summary of the various conditions/apparatuses tested with the selected condition (condition 8) highlighted in blue. Abbreviations: mo: month; V: volts.