. 2016 Jan 25;11(1):e0147484. doi: 10.1371/journal.pone.0147484
© 2016 Vos 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 2. Summary of risk of bias.
