OBJECTIVE: We assessed in a randomized study the feasibility and efficacy of awake video-assisted thoracoscopic bullectomy with pleural abrasion to treat spontaneous pneumothorax.

目的：我们在一项随机研究中评估清醒下胸腔镜肺大疱伴胸膜磨损手术治疗自发性气胸的可行性及有效性。

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The study was part of a larger randomized controlled trial conducted in Mexico by researchers from Emory University and local investigators.

该研究是在墨西哥进行的一个更大的随机控制实验的组成部分，研究者是埃默里大学和当地的研究者。

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The study is the first to use data from a randomized experiment to learn about the connection between neighborhoods and risk of obesity and diabetes, he says.

该研究是第一次利用随机实验数据来获知社区与肥胖及糖尿病之间的联系，他说。

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Researchers conducted a randomized study of 675 patients diagnosed with stage three colon cancer.

VOA: standard.2010.03.18

"The biggest mistake of ablation was that there wasn't a big randomized study when the technology came out, " he says.

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It is a randomized controlled study, meaning that similar patients were assigned at random to either get either Centrum or placebo.

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For one, the groups noted the analysis is a retrospective study, not a prospective, randomized controlled clinical trial, which many regard as a gold standard for ferreting out safety concerns.

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