. 2021 Jul 23;2021:5530441. doi: 10.1155/2021/5530441
Copyright © 2021 Zhihua Zhu and Wenyu Zhang.
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 2.
Risk of the bias graph.