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. 2019 Dec 30;19:266. doi: 10.1186/s12890-019-1026-0

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© The Author(s). 2019

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. 1 — Boxplots of sputum parameters with at least one significant increase (p < 0.05). Fifty out of 92 measurements were below LOQ for IL-6. Significance level after Bonferroni correction is α = 0.0167. Asterisked p-values are statistically significant