To assess the conditions under which employing an overview of systematic reviews is likely to lead to a high risk of bias.

中文翻译：

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评审概述中存在偏见的风险：方法指导和四项清单的范围界定评审。

要评估在何种情况下使用系统综述的概述可能会导致出现偏见的风险较高。