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. 2016 Jan 20;15:8. doi: 10.1186/s12904-016-0077-8

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© Costa 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 — Citation Flow Chart. ^aMeta-analyses were performed if deemed appropriate and if more than one study was available for each determinant. The number of studies included in each analysis varied according to the number of studies that reported on each determinant