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. 2018 Sep 3;18:136. doi: 10.1186/s12883-018-1138-9

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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. 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 — Comparison of pulmonary infection rate. (a) Comparison of pulmonary infection rate between minimal invasive surgery group and conservative group. (b) Comparison of pulmonary infection rate between minimal invasive surgery group and craniotomy group