DESIGN: a clinical controlled observation.
设计：临床对照观察。
DESIGN: a controlled observation experiment.
设计：对比观察实验。
DESIGN: a randomized controlled observation.
设计：随机对照观察。
DESIGN: Homochronous and controlled observation.
设计：同期对照观察。
DESIGN: a randomized single blind controlled observation.
设计：随机单盲对照观察。
DESIGN: Randomized controlled case observation.
设计：随机对照病例观察。
DESIGN: Randomized controlled case observation.
设计：随机对照病例观察。
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