被公认准确性最高的加拿大试验25年随访项目（鉴于参与者均按风险因素悉心整理过，并且能够获得最先进的治疗）得出的结论甚至更加糟糕。
The results of the 25-year follow-up of the Canadian trial – which can be considered the most accurate, given that the women were carefully characterized according to risk factors and had access to the most advanced treatments – are even more damning.