I don't think that is accurate, either - unless you are looking at specific areas, specific demographics, etc.

Again, please post a link to your citation?

I think some of this is that healthcare is better in some countries than others. I have read reports about national healthcare in Canada being so slow that people that can afford it had been going to the us for services. MRI's, CT's and other things like knee replacement and even x=rays. Things have slowed down some in the US with the expansion of healthcare over the last 10 or so years. But if a country has poor health care then cancer will not be found so there will be fewer cases diagnosed. And if a country has really good health care then more cases will be diagnosed. Maybe this will not account for all the difference but it would a bit I think.