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In this special article, Freis detailed the correlation between elevated blood pressure and salt intake by analyzing differences between people in developed countries, such as the United States, and underdeveloped societies, where presumably the levels of dietary salt would be considerably lower.
Periodical. Freis, Edward D. "Salt, Volume and the Prevention of Hypertension." Circulation 53, 4 (April 1976): 589-595. Article. 7 Images.. Circulation