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. 2017 Dec 4;17:167. doi: 10.1186/s12890-017-0521-4

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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. 1 — Correlation of NT-proBNP with pulmonary vascular resistance (PVR) in different age groups. Whereas older study participants show a linear correlation between the biomarker and the PVR, serum levels of NT-proBNP were much lower in younger patients, even when very high PVR values could be measured (dots in the circle)