Fewer Americans are dying from heart disease compared with 40 years ago, but not all parts of the country are showing the same downward trend, a new federal government study finds.
Researchers say the nation's heart-disease hotbeds have largely migrated south. In the 1970s, U.S. counties with the highest death rates from heart disease were clustered in the Northeast; now they are concentrated in Southern states, especially the deep South.
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