However, they stressed that they could not find a causal link.
但他们无法找出具体的联系。
However, they are consistent with other evidence to suggest a possible causal link.
不过，研究结果与其他能证明这种因果关系可能存在的证据具有一致性。
However, they are consistent with other evidence to suggest a possible causal link.
不过，研究结果与其他能证明这种因果关系可能存在的证据具有一致性。
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