The NLST is the first trial with sufficient numbers of participants using a randomized design to enable the comparison of mortality differences between spiral CT and chest X-ray, Aberle said.
NLST则是第一次包含大量随机指定的受试者的实验，使得在螺旋CT成像和X射线胸透之间做死亡率的比较成为了可能。
Methods and Results— We conducted a randomized multicenter comparison of these 2 treatment strategies in patients with paroxysmal AF resistant to at least 1 antiarrhythmic drug.
方法和结果—对于这两种治疗方法，我们在至少对一种抗心律失常药物耐药的陈发性房颤患者中进行了一个随机的多中心的对比研究。
DESIGN: a randomized grouping comparison and placebo controlled study.
设计：随机对比观察，安慰剂对照。
DESIGN: a randomized grouping comparison and placebo controlled study.
设计：随机对比观察，安慰剂对照。
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