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. 2017 Aug 11;17:90. doi: 10.1186/s12893-017-0286-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. 3 — Trend for changes in mean blood pressure. T0 is the time point at the initiation of surgery. T15, T30, and T60 are at 15, 30, and 60 min after the initiation of surgery, respectively. At T15, in the preoperative group and in the control group, mean blood pressure significantly decreased compared to these at T0. *,P < 0.017 (0.05/3), t-test with a Bonferroni correction