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. 2016 Aug 2;1:10. doi: 10.1186/s41256-016-0010-y

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© The Author(s) 2016

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 — Illustration of funnel plot asymmetry due to heterogeneity. The figure shows the Funnel plot of standard error by logit event rate for all studies (a), community based studies (b), and hospital based studies (c)