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. 2016 Apr 19;16:43. doi: 10.1186/s12886-016-0217-1

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© Dong et al. 2016

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 — The oxygen saturation of arterioles, venules and AV-difference in the four groups studied. Both arteriolar and venular oxygen saturation showed increasing trend with increasing severity of disease (**p < 0.01)