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. 2019 Feb 12;7(2):2325967118825469. doi: 10.1177/2325967118825469

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© The Author(s) 2019

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. — PRISMA (Preferred Reporting Items for Systematic Meta-Analyses) flowchart showing application of inclusion and exclusion criteria to search results.