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Freis conducted many studies of circulation processes concurrently with his clinical investigation, to better understand the actions of antihypertensive drugs. In this article he and Schnaper report on experiments on the forearm circulation.
Periodical. Freis, Edward D., and Harold W. Schnaper. "The Effects of a Variety of Hemodynamic Changes on the Rapid and Slow Components of the Circulation in the Human Forearm." The Journal of Clinical Investigation 37, 6 (June 1958): 838-845. Article. 8 Images.. The Journal of Clinical Investigation