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. 2019 Dec 5;20:278. doi: 10.1186/s12931-019-1240-6

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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. 3 — Correlations between morphologic markers of the angiogenic process and clinical and functional parameters of COPD patients and SHS. Positive significant correlations between the proportion of capillary profiles associated with Pc/EC interdigitations in post-training vastus lateralis biopsies and a forced expiratory volume in 1 s (FEV₁) (% predic.), b post-training values of symptom-limited oxygen uptake ( $V̇ O_{2 sl}$ ), in both COPD patients (grey circles) and SHS (white circles)