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. 2016 Oct 21;9:475. doi: 10.1186/s13104-016-2280-3

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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. 3 — Temporal trend of clinical trials registry search by systematic reviews in the top 20 pregnancy and childbirth journals. The number (left vertical axis) of systematic reviews and meta-analyses searching (blue line) and not searching (orange line) clinical trials registries between 2007 and 2015. The grey bars represent the percentage (right vertical axis) of systematic reviews and meta-analyses that searched clinical trials registries for the given year