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: Randomized and double blind observation.
设计：随机双盲法观察。
Methods: Randomized double blind study was employed.
方法：随机双盲对照临床研究。
Methods The random and double blind method was used.
方法采用随机双盲方法。
DESIGN: Randomly double blind and control experiment.
设计：随机双盲对照实验。
Methods:this was a randomized, double blind controlled trial.
方法：采用随机双盲对照研究。
Methods A random, double blind, and placebo control study was conducted.
方法采用随机双盲、安慰剂平行对照研究。
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: Random, double blind and double central prospective study was adopted.
方法：采用随机、双盲、双中心前瞻性研究。
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。
Double blind was used in the experiment.
整个实验采用双盲法。
Double blind test was used in whole experiment.
整个实验采用双盲法。
DESIGN: Double blind, randomized controlled study.
设计：本研究采用双盲、随机、对照方法。
In a double-blind trial, there were some improvements.
在一个双盲测试中，有了一些进步。
In a double-blind trial, there were some improvements.
在一个双盲测试中，有了一些进步。
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