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. 2019 Aug 5;19:767. doi: 10.1186/s12885-019-5938-0

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© The Author(s). 2019

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. 2 — Publication bias assessment of included studies (a, b) and quality assessment of included studies (c-f). a, b: Deeks’ Funnel Plot shows no publication bias in both detecting (a) and grading (b) gliomas. c-f: The graphs show risk of bias and applicability concerns regarding each study. Quality assessment result for diagnosis (c, e); for grading (d, f)