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. 2019 Aug 17;5:2333721419870345. doi: 10.1177/2333721419870345

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© The Author(s) 2019

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work 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. — Summary of literature search and screening process (PRISMA flow diagram).

Note. CDC = Centers for Disease Control and Prevention; BC CDC = British Columbia Center for Disease Control; WHO = World Health Organization; PRISMA: Preferred Reporting Items for Systematic Reviews and Meta-Analyses.