. 2020 Jan 10;99(2):e18623. doi: 10.1097/MD.0000000000018623
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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
Table 2.
Risk of bias was assessed using the Newcastle-Ottawa Scale.
