2.4. Data Extraction and Quality Assessment

XC Xiaoming Cui
JZ Jing Zhou
ZQ Zongshi Qin
ZL Zhishun Liu
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The data on the study methods and characteristics, participants, interventions, control, and outcomes were extracted from papers using a data extraction form. The authors were called or e-mailed to request provisions of any missing data. The reviewers assessed the risk of bias using the Cochrane Risk of Bias tool [18].

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