. 2018 Apr 23;2018:8071579. doi: 10.1155/2018/8071579
Copyright © 2018 Kununya Pimolbutr 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.
Flow chart of the study selection process.