In my Canadian province (not sure if the others do this), every year all women get sent a letter from the government reminding them to get mammograms. Because every citizen gets a government-issued health card that you give whenever you need anything medical done, people keep it updated with their current info and this is how they get your info to send out the letter.
In my understanding, Americans are reluctant to have the government intrude on their health care and would find this as intruding on their privacy. I’ve split the poll up into Americans and non-Americans to see how the responses may vary.