数据析取：使用预先确定的美国预防服务工作组的判断标准对研究的质量进行考查、提取和评定。
Data Extraction: Studies were reviewed, abstracted, and rated for quality by using predefined U. S. Preventive Services Task Force criteria.
数据析取：使用预先确定的美国预防服务工作组的判断标准对研究的质量进行考查、提取和评定。
Data Extraction: Studies were reviewed, abstracted, and rated for quality by using predefined U. S. Preventive Services Task Force criteria.
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