Design: Double blinded and randomized design.

设计随机分组双盲设计。

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DESIGN: a complete randomized double blinded grouping study was conducted.

设计：完全随机、双肓法分组研究。

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They had assumed that these types of devices should and would be subject to random double-blinded studies with controls over an appropriate time-frame to investigate safety and efficacy.

他们原先认为，这些类型的设备应该也将会在适当的时间框架内接受随机、双盲对照研究，对其安全性和有效性进行调查。

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If both patients and health care providers are blinded, the trial is said to have a double-blinded design.

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Dr. Hartwell, who wasn't involved in the study, said social-network trials aren't likely to replace conventional randomized, double-blinded, placebo-controlled trials, the gold-standard for generating medical evidence.

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