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. 2017 Dec 4;17:170. doi: 10.1186/s12890-017-0512-5

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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. 2 — Alpha diversity analysis. Within-sample diversity measured by the Shannon-Index (a), Pielou’s measure of species evenness (b) and observed OTUs (c). Samples were rarefied to a sampling depth of 1000. Kruskal Wallis test was performed to analyze statistical significance