Assessment of risk of bias†.
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† Risk of bias were assessed according to the handbook of Cochrane. Each item was graded as “low”, “high” and “unclear”.Assessment of risk of bias†.
† 偏倚风险（Risk of bias）的评估依据考克兰（Cochrane）手册开展，每一项均被评定为‘低’‘高’与‘不确定’三个等级。偏倚风险评估†
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2015-12-03
