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. 2019 Jan 23;19:13. doi: 10.1186/s12873-019-0221-x

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© The Author(s). 2019

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. 1 — Mean value of prehospital volume of all severely injured patients with severe traumatic brain injury (TBI). 1352 patients met the inclusion criteria. Based on matching criteria, 169 of these patients in each group underwent further analysis