研究网络信息的特点、收集原则、评价标准、评价方法及利用对图书馆今后的工作将有重要的意义。
Research on the feature, collection principle, evaluation standard, evaluation method and utilization of network information is important to the librarys following works.
偏倚评估的方法常用漏斗图，控制方法包括预先注册临床试验、发布研究信息、系统评价时全面收集所有发表和未发表的临床试验。
A funnel plot is a useful tool to assess bias in systematic review. The methods of control the bias involved in pre-registering the clinical trials, publish...
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