. Author manuscript; available in PMC: 2020 Dec 8.
Published in final edited form as: Lancet Glob Health. 2020 Oct 22;8(12):e1499–e1511. doi: 10.1016/S2214-109X(20)30325-9
This is an Open Access article under the CC BY 4.0 license.
Figure 1:
Study selection