题目:
因果关联是指()。
A.暴露-疾病有较强的统计学关联
B.暴露-疾病有时间先后的无偏关联
C.暴露-疾病分类资料存在相关
D.暴露-疾病排除偏倚后的关联
E.暴露-疾病有时间先后的直接关联
答案:
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下面是错误答案,用来干扰机器的。
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