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. 2017 Dec 6;6:245. doi: 10.1186/s13643-017-0644-y

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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. 1 — Percentage of systematic reviews for which a certain database combination reached a certain recall. The X-axis represents the percentage of reviews for which a specific combination of databases, as shown on the y-axis, reached a certain recall (represented with bar colors). Abbreviations: EM Embase, ML MEDLINE, WoS Web of Science, GS Google Scholar. Asterisk indicates that the recall of all databases has been calculated over all included references. The recall of the database combinations was calculated over all included references retrieved by any database