. 2016 Sep 29;11(9):e0163508. doi: 10.1371/journal.pone.0163508
© 2016 Spruijt 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. Flowchart of country inclusion and data collection.
