目的为避免选择和发表偏倚，系统评价者应采用多种查询技术，并尽力获得未发表的研究。
Primary objective to avoid selection and publication bias, systematic reviewers should employ a broad range of search techniques and make efforts to locate unpublished studies.
培训评价者正确使用绩效评价系统。
培训评价者正确使用绩效评价系统。
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