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. 2018 Jan 18;8:1142. doi: 10.1038/s41598-017-17851-8

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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The analysis of alpha-diversity (Chao1 index) and beta-diversity (unweighted Unifrac) in the three ethnic groups. (a) The chao1 index at the 4200 sequences per sample in the rarefaction curve; P was calculated from the analysis of variance. (b) The unweighted UniFrac; P was calculated from the permutational multivariate analysis of variance.