There's a lot of value on doing this, but GP idea has its value. For starters, there's some survivorship bias, as you cannot map people who have already died.

There's a lot of value on doing this, but GP idea has its value. For starters, there's some survivorship bias, as you cannot map people who have already died. You may also want to gather more detailed data that the medical history usually conveys, such as sub-clinical conditions and other non-pathological differences.