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. 2019 Mar 20;9:4747. doi: 10.1038/s41598-019-41066-8

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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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Representative fluorescent images obtained from the IPCs of fluorescein-stained rabbit eye. For the positive control group, a glass capillary tube was placed in contact with the IPC once. For the tear-glucose device group, the tear-glucose device was applied to the IPC four times at intervals of 15 min during 60 min. For the negative control group, no treatment was applied to the IPC.