在大量证据表明，有先兆偏头痛（即在偏头痛发作前有先兆出现，也称经典偏头痛——译者注）病史的个体，患有P.

There is considerable evidence to suggest that individuals who experience migraines with aura are at least twice as likely to have a P.

youdao

所以，即便存在证据表明患有先兆偏头痛的病人有较高风险患有P.F.O.（反之亦然），也没有确定的证据能够说明两者存在因果关系。

So, while the evidence is mounting that if you have migraine with aura, you are at increased risk of having a P.F.O. (and vice versa), there is no firm evidence that this association is causal.

youdao

所以，即便存在证据表明患有先兆偏头痛的病人有较高风险患有P。

So, while the evidence is mounting that if you have migraine with aura, you are at increased risk of having a P.

youdao