. 2019 Jul 22;2019:8512405. doi: 10.1155/2019/8512405
Copyright © 2019 Shan-Shan Lin 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 the literature selection process.