. 2015 Jul 17;10(7):e0132340. doi: 10.1371/journal.pone.0132340
© 2015 Stokes 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 properly credited.
Fig 2. PRISMA flow diagram of study selection [56].
