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. 2021 Aug 17;12:701690. doi: 10.3389/fphar.2021.701690

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Copyright © 2021 Ma and Ge.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Risk of bias graph. (A) Authors’ judgments about each risk of bias item presented as percentages across all included studies. (B) Risk of bias summary. Authors’ judgments about each risk of bias item for each included study.