两个病例已得到国家卫生和流行病学研究所的证实。
These cases were confirmed at the National Institute for Hygiene and Epidemiology.
可是流行病学的研究发现，几组资料在数据方面有所关联，却没有证实其因果关系。
But epidemiological studies, which find statistical associations between sets of data, do not prove cause and effect.
可是流行病学的研究发现，几组资料在数据方面有所关联，却没有证实其因果关系。
But epidemiological studies, which find statistical associations between sets of data human hair wigs, do not prove cause and effect.
背景：近年来临床和流行病学相关研究都证实部分口腔疾病的发生与心理应激因素相关。
BACKGROUND: It has been verified in relevant clinical and epidemiological researches in recent years that a part of stomatopathy is associated to psychological stress factors.
流行病学研究已证实，血清总胆红素水平与冠心病发病率呈负相关关系。
There are growing epidemiological evidences that lower serum bilirubin levels associated with increase risk of developing coronary heart disease.
流行病学研究已证实，血清总胆红素水平与冠心病发病率呈负相关关系。
There are growing epidemiological evidences that lower serum bilirubin levels associated with increase risk of developing coronary heart disease.
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