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aDepartment of Medicine, Harvard Medical School, Beth Israel Hospital, Boston, Massachusetts
bDepartments of Medicine and Laboratories, Beth Israel Hospital, Boston, Massachusetts
1
This investigation was supported by research grants from the United States Public Health Service (E-883 (C-2)), the Massachusetts Heart Association and by a research contract DA-49-007-MD-892 between the Office of the Surgeon General, Department of the Army, and Harvard University.