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. 2017 Nov 28;17:159. doi: 10.1186/s12890-017-0509-0

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© The Author(s). 2017

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 — Frequency of GPR15+ cells among T cells in non-smoker of volunteers and never smokers in lung patients. Lung diseases do not influence the frequency of GPR15+ cells in blood The dashed line illustrates the cut-off of 7.6% for discrimination between never and former/current smokers. Box plots illustrates median, 25% and 75% percentile, non-outlier max and – min, outlier (circle) and extremes (triangle). Number of volunteers and patients is enclosed in parenthesis. COPD, chronic obstructive pulmonary disease; ILD, interstitial lung disease