. 2017 Jul 24;2017:8971059. doi: 10.1155/2017/8971059
Copyright © 2017 Mingzhu Liu 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 1.
Flowchart of identifying and including studies.