Assessment of Risk of Bias

BL Bing Li
LL Li Liang
HD Huijie Deng
JG Jinmin Guo
HS He Shu
LZ Li Zhang
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Two reviewers performed the assessment of study quality independently. Disagreements were solved by discussion. The risk of bias were evaluated according to the Cochrane handbook (Higgins and Green, 2011). Random sequence generation and allocation concealment(selection bias), blinding of participants and personnel(performance bias), blinding of outcome assessment(detection bias), incomplete outcome data(attrition bias), selective reporting(reporting bias), and other biases were assessed.

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