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. 2017 Apr 8;3:13. doi: 10.1186/s40981-017-0084-7

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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.

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Fig. 1 — Box plots of preoperative rSO₂ (a) and SpO₂ (b) values stratified by HD. Horizontal bold lines represent median values. rSO ₂ regional cerebral oxygen saturation, SpO ₂ arterial oxygen saturation of pulse oximetry, HD hemodialysis, n.s. not significant