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. 2018 Jul 4;19:108. doi: 10.1186/s12881-018-0628-3

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© The Author(s). 2018

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. 3 — Funnel plot for studies investigating the effect of VEGF gene polymorphisms on CAD risk. a Funnel plot for publication bias on the rs699947 polymorphism; b Funnel plot for publication bias on the rs2010963 polymorphism; c Funnel plot for publication bias on the rs3025039 polymorphism. Abbreviation: OR = odds ratio