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. 2019 Jan 18;20:19. doi: 10.1186/s12881-019-0751-9

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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 — Alleles (a) and genotypes (b) distribution of − 82 A-to-G SNP of MMP-12 gene (rs2276109) in COPD patients and healthy control groups. Legend: COPD, patients with chronic obstructive pulmonary disease; CTR – controls; OR (95%CI) calculated for -82G allele in COPD patients-controls comparison was of 0.70 (0.51–0.95)