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. 2015 Aug 26;15:822. doi: 10.1186/s12889-015-2171-x

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© Young et al. 2015

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 — Scoping and systematic review flow-chart. Languages excluded during article characterization included: Chinese (n = 11), Korean (8), Portuguese (5), Japanese (5), Italian (2), German (2), Turkish (2), Polish (1), Lithuanian (1), and Hebrew (1). Note: Two of the 77 relevant articles reported more than one study design