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. 2015 Sep 15;14:25. doi: 10.1186/s12991-015-0063-1

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© Dragioti et al. 2015

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 — ROR and 95 % confidence intervals (CIs) for each comparison of an “allegiant” vs. “non-allegiant study”. The summary ROR has been calculated with random effects model. A ROR >1 favors allegiance; a ROR <1 favors non-allegiance