. 2019 Oct 27;2019:2371084. doi: 10.1155/2019/2371084
Copyright © 2019 Feng Xiong 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.
PRISMA flowchart of the study selection process.