. 2020 Feb 18;8:890. Originally published 2019 Jun 20. [Version 2] doi: 10.12688/f1000research.19506.2
Copyright: © 2020 Morken IS et al.
This is an open access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1. PRISMA flow chart of the study search strategy.
