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. 2015 Oct 10;17:283. doi: 10.1186/s13075-015-0793-0

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© Sasaki et al. 2015

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. 2 — Concentration of serum hyaluronic acid by Kellgren–Lawrence (KL) grade. P values <0.05 were found compared with *KL grade 0, ^†grade 1, ^‡grade 2, and ^#grade 3