Even the Harvard study did not prove a direct correlation but noted strong associations between exposure and risk of behavioral issues.

就连哈佛大学的研究也没有证明两者之间有直接的联系，但指出了这种接触与行为问题风险之间的强烈关联。

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There was no correlation between the behavioral tests results and histological changes.

但行为学测试结果与组织学改变无相关性。

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