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. 2016 Jan 18;20:12. doi: 10.1186/s13054-016-1183-y

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© Jia 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. 2 — Severity categories of vital signs and arterial blood gas analysis. SBP systolic blood pressure, SpO ₂ pulse oximetry, PaO ₂ partial pressure of oxygen in arterial blood, PaCO ₂ partial pressure of carbon dioxide in arterial blood, HCO ₃ ⁻ bicarbonate level