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. 2018 Sep 10;4:67. doi: 10.1186/s40981-018-0205-y

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© The Author(s) 2018

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 — The relationship between the SAS value and the 90-day mortality and 30-day postoperative complications. Patients were divided into two groups: the low-risk group (SAS ≥ 7) and high-risk group (SAS ≤ 6). Black bar: The 90-day mortality in each group. Gray bar: 30-day postoperative complications