. 2021 Apr 15;5(2):zrab013. doi: 10.1093/bjsopen/zrab013
© The Author(s) 2021. Published by Oxford University Press on behalf of BJS Society Ltd.
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.
Fig. 1.
PRISMA diagram showing selection of articles for review