报告真实资料的个案报告、病例分析、调查和其他观察性研究均包括在内，然而评论文章、译文和临床试验均未包括在内。
Case reports, case series, surveys and other observational studies were included if they reported factual data, but review articles, translations and clinical trials were excluded.
从发表在《临床传染病》上的综合研究来看，自1930年确认第一例猪流感传染人类的病例以来，世界上被感染的人只有数十位。
According to a comprehensive study published in the journal Clinical Infectious Diseases, swine flu had infected only several dozen people in the world since it was first identified in 1930.
科克伦系统评价数据库于2007年收录的一份研究报告显示，研究人员曾集中分析了六例临床实验病例，以观察咖啡因对哮喘的疗效。
In a 2007 study in the Cochrane Database of Systematic Reviews, researchers pooled and analyzed the results of a half dozen clinical trials looking at the effects of caffeine on asthmatics.
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