结果通过检索，共获得11篇相关文献，其中3篇随机对照试验，3篇病例对照试验和5篇病例报道。
Results By our searching; we got 11 papers including 3 randomized control trial; 3 case control trial and 5 other case reports.
研究设计：为试验一种新的诊断方法而做的预期病例对照研究。
Study Design. Prospectie case-control study testing a new diagnostic method.
现有的研究包括29个队列研究，69个病例对照研究以及4个随机临床试验。
Of the available studies, 29 were cohort studies, 69 case-control studies, and 4 randomized clinical trials.
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