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. 2018 Apr 9;38:6. doi: 10.1186/s41232-018-0062-0

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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. 2 — Correlations between different factors and salivary epidermal growth factor (EGF) output in the Sjögren’s syndrome (SS) group. a Correlation of salivary flow rate with salivary EGF output (n = 13). b Correlation of disease duration with salivary EGF output (n = 24). c Correlation of the Oral Health Impact Profile (OHIP)-14 score with salivary EGF output (n = 10). Correlations were assessed using Spearman’s rank correlation coefficient