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. 2016 Jun 1;17(2):1470320316653283. doi: 10.1177/1470320316653283

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© The Author(s) 2016

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 3.0 License (http://www.creativecommons.org/licenses/by-nc/3.0/) which permits non-commercial use, reproduction and distribution of the work 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 3. — Begg’s funnel plot for testing publication bias. Each circle indicates a separate study. (a) TG vs. TT; (b) GG vs. TT; (c) dominant model; (d) recessive model. OR: odds ratio.