Used. sanjay, walk us through what the study found. >> yeah, this is so interesting to sort of look at screening and trying to quantify just how much of an impact these screening tests make. i always find these studies interesting. as you mention, first of all, jake, there is a recommendation for people to get the primary screening, the first screening test start at age 45. used to be 50 a few years ago. they said it can go to 45 to 75 is the age. older than that you should talk to your doctor if you have a significant family history, for example. what they were looking at in this study, thoug...