. 2015 Oct 12;2015:846851. doi: 10.1155/2015/846851
Copyright © 2015 Cai-Yu-Zhu Wen et al.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 7.
Process of searching for and screening studies.