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. 2021 Jul 19;20:15330338211033060. doi: 10.1177/15330338211033060

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© The Author(s) 2021

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) 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 pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 3. — Forest plots of the included literatures evaluating the correlation between XRCC1 Arg399Gln variants with HNC risk. (A) AA vs GG; (B) AG vs GG; (C) AA + AG vs GG; (D) AA vs AG + GG.