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O. F. Hedley, Rheumatic Heart Disease in Philadelphia Hospitals: A Study of 4,653 Cases of Rheumatic Heart Disease, Rheumatic Fever, Sydenham's Chorea, and Subacute Bacterial Endocarditis Involving 5,921 Admissions to Philadelphia Hospitals from January 1, 1930, to December 31, 1934. III. Fatal Rheumatic Heart Disease and Subacute Bacterial Endocarditis, Public Health Reports (1896-1970), Vol. 55, No. 38 (Sep. 20, 1940), pp. 1707-1740
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O. F. Hedley (1940) studied this question.
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