. 2021 May 26;10:233. Originally published 2021 Mar 24. [Version 2] doi: 10.12688/f1000research.51590.2
Copyright: © 2021 Onakpoya IJ 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 2. Risk of bias (n=63 primary studies).
