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临床试验
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临床试验
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临床试验
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clinical trial
临床试验
以病人作为研究对象,用以评价某种疾病的疗法或某种预防疾病(死亡或残疾)的方法。临床试验是最常用的流行病学实验研究类型。
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clinical trial
临床试验
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