. 2017 Feb 10;96(6):e5980. doi: 10.1097/MD.0000000000005980
Copyright © 2017 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 1.
Flow chart of the literature search used in this meta-analysis.