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. 2017 Jan 7;17:11. doi: 10.1186/s12935-016-0371-9

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© The Author(s) 2017

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. 4 — Begg’s funnel plot analysis and Egger’s test to detect publication bias. Each point represents a separate study for the indicated association. a Begg’s funnel plot analysis and Egger’s test for contrast T/T + C/T vs. C/C. b Begg’s funnel plot analysis and Egger’s test for contrast c2/c2 + c1/c2 vs. c1/c1. c Begg’s funnel plot analysis and Egger’s test for contrast C/C + D/C vs. D/D