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. 2018 Dec 13;8(4 Suppl):49S–58S. doi: 10.1177/2192568218799058

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© The Author(s) 2018

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 License (http://www.creativecommons.org/licenses/by-nc-nd/4.0/) which permits non-commercial use, reproduction and distribution of the work as published without adaptation or alteration, without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Flowchart outlining the systematic review process. The initial PubMed search resulted in 1286 articles. Subsequent screening and application of inclusion and exclusion criteria yielded 50 total articles to undergo detailed review and pooling of data. Two additional articles were identified after similar process through Cochrane Review.