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. 2017 Aug 28;21:225. doi: 10.1186/s13054-017-1814-y

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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. 4 — Color Doppler imaging and Doppler flow measurements. Short-axis (transverse) view of the right internal jugular vein (blue) and the carotid artery (red) using color Doppler imaging and Doppler flow measurements of the venous (a) and arterial (b) blood flow profile (Color figure online)