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。
DESIGN: a completely randomized, double blind controlled trial was conducted.
设计：完全随机双盲实验对照研究。
Methods:this was a randomized, double blind controlled trial.
方法：采用随机双盲对照研究。
METHODS: It was a randomized, double blind, double model, parallel controlled clinical trial.
方法：采用随机、双盲双模拟、平行对照方法。
The data are from an extension study of a randomized, double-blind, placebo-controlled trial.
这些数据来自一个随机、双盲、安慰剂对照试验、根据研究。
DESIGN: Double blind, randomized controlled study.
设计：本研究采用双盲、随机、对照方法。
DESIGN: Double blind, randomized controlled study.
设计：本研究采用双盲、随机、对照方法。
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