. 2021 Sep 20;14:17562848211042679. doi: 10.1177/17562848211042679
© The Author(s), 2021
This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://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 page (https://us.sagepub.com/en-us/nam/open-access-at-sage).
Figure 1.
PRISMA flow diagram.
Adapted from Moher and colleagues.26