. 2015 Jun 1;10(6):e0129824. doi: 10.1371/journal.pone.0129824
© 2015 Zheng 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 1. Flowchart of the study selection process.
