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. 2016 Jan 16;13:5. doi: 10.1186/s12978-015-0104-x

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© Ayanore et al. 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. 1 — Main chain of key words applied in the literature search across seven databases. Possible synonyms and MeSH term categories for all key words were developed and applied in all database searches