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. 2015 Nov 2;3(11):2325967115612416. doi: 10.1177/2325967115612416

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© The Author(s) 2015

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License (http://www.creativecommons.org/licenses/by-nc-nd/3.0/) which permits non-commercial use, reproduction and distribution of the work as published without adaptation or alteration, without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — Univariate rate ratio calculations of injury incidence rates per 1000 minutes of exposure with 95% CIs. KO, knockout; ref, reference; TKO, technical knockout.