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. 2021 Apr 30;24(7):535–541. doi: 10.1093/ijnp/pyab023

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© The Author(s) 2021. Published by Oxford University Press on behalf of CINP.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — PRISMA flow diagram outlining the systematic review process. Abbreviation: PRISMA, Preferred Reporting Items for Systematic Reviews and Meta-Analyses.