pone.0239341.g002.tif (954.06 kB)

Risk of bias graph.

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posted on 25.09.2020 by Liangjun Zhao, Fang Xu, Shan Lao, Jingmin Zhao, Qingjun Wei

“Plus” indicates a low risk of bias; “minus” indicates a high risk of bias; and “question mark” indicates unclear or unknown risk of bias.

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