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. 2019 Jul 19;19:716. doi: 10.1186/s12885-019-5924-6

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© The Author(s). 2019

Open Access This 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 — Funnel plots for the publication bias test. Each point represents a separate study for the indicated association. The vertical line represents the mean effects size: (4A) advanced age; (4B) gender; (4C) CIS; (4D) LVI; (4E) pathological stage; (4F) STSM; (4G) histology; (4H) ATC; (4I) tumor grade and (4 J) LNM