. 2020 Apr 30;17(4):e1003100. doi: 10.1371/journal.pmed.1003100
© 2020 Jarvis et al
This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Fig 1. PRISMA diagram of study selection.
