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. 2019 Feb 19;9:2301. doi: 10.1038/s41598-019-38868-1

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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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Inter-group comparisons of scotopic (A,C) and photopic (B,D) ERG amplitudes. Relative ERG amplitude was calculated as amplitude at d21pi divided by that at baseline. The asterisk marked above each bar represents the statistical significance of comparison between EAU + Water group and the corresponding group. Data are also presented as mean ± SEM and analyzed by Mann–Whitney U test (*P < 0.05, **P < 0.01, ***P < 0.001, ns = no significance).