. 2014 Dec 26;9(12):e116018. doi: 10.1371/journal.pone.0116018
© 2014 Dendumrongsup 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.
Figure 1. PRISMA flow diagram [8] for the systematic review.
