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. 2020 Feb 18;18:24. doi: 10.1186/s12961-020-0536-9

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© The Author(s). 2020

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 — PRISMA flow chart describing screening of papers. This figure is a visual representation in flow chart that describes how many papers were excluded at each step of the meta-narrative review screening by the authors. It is based on Moher et al.’s [45] PRISMA flow chart for systematic reviews and meta-analysis