. 2020 Feb 14;99(7):e19107. doi: 10.1097/MD.0000000000019107
Copyright © 2020 the Author(s). Published by Wolters Kluwer Health, Inc.
This is an open access article distributed under the Creative Commons Attribution License 4.0 (CCBY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. http://creativecommons.org/licenses/by/4.0
Figure 3.
Funnel plot of publication bias of the included studies.