Design: Completely randomized grouping design and controlled study.

设计：完全随机分组设计，对照试验。

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The answer is the "gold standard" double blind, placebo controlled study.

答案是“金标准”，双盲，安慰剂对照研究。

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Study Design. This study was a prospective, randomized, controlled study.

研究设计：本研究为随机，对照，前瞻性研究。

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In a controlled study, some patients would have taken aspirin.

VOA: special.2009.09.01

Packer says this is the first placebo-controlled study in acute heart failure to show a clinical benefit.

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Observations, especially observations gathered through controlled study through the scientific method, are data.

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The Symplicity HTN-2 trial is an international, multi-center, prospective, randomized, controlled study of renal denervation in patients with treatment-resistant hypertension.

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