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. 2016 Dec 30;95(52):e5794. doi: 10.1097/MD.0000000000005794

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Copyright © 2016 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

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Table 1.

Main characteristics of studies included in the meta-analysis.

2.3.