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. 2014 Dec 16;14:202. doi: 10.1186/1471-2466-14-202

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© Bikov et al.; licensee BioMed Central. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Relationships between “breathprint” and FEV ₁ /FVC as well as age. Significant associations were found between PC2 and FEV₁/FVC (p = 0.03, r = 0.41, Panel A) as well as between PC3 and age (p = 0.002, r = 0.56, Panel B).