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DESIGN: a randomized self controlled study before and after treatment.
设计：随机、治疗前后自身对照研究。
youdao
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DESIGN: a self controlled study was conducted.
设计：自身对照的研究。
youdao
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DESIGN: A self controlled study.
设计：自身对照研究。
youdao
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DESIGN: A self controlled study.
设计：自身对照研究。
youdao