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. 2018 May 16;23:17. doi: 10.1186/s12199-018-0707-2

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Effects of fluoride on serum creatinine and urea in rats after 15, 30, and 60 days. a Serum creatinine levels. b Serum urea levels of rats exposed to distilled water and different concentrations of fluoride (0.5, 5, and 20 ppm) for 15, 30, and 60 days. *p < 0.05 compared with 0.5 ppm; †p < 0.05 compared with 5 ppm. Error bars represent standard error