. 2019 Mar;19(1):1311–1320. doi: 10.4314/ahs.v19i1.2
© 2019 Zhen. et al.
Licensee African Health Sciences. This is an Open Access article distributed under the terms of the Creative commons Attribution License (https://creativecommons.org/licenses/BY/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1.
The flowchart of the included studies in the meta-analysis;