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DESIGN: a randomized controlled observation.
设计：随机对照观察。
youdao
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DESIGN: a randomized single blind controlled observation.
设计：随机单盲对照观察。
youdao
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DESIGN: Randomized controlled case observation.
设计：随机对照病例观察。
youdao
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DESIGN: Randomized controlled case observation.
设计：随机对照病例观察。
youdao