“…Neptune, W. B., and Bailey, C. P. (1954) The incidence of mitral valve disease in elderly patients is much higher than is commonly realized. Some clinical studies-for example, those of Baker and Musgrave (1947), Cookson (1949), Kaufman and Poliakoff (1950), Appel and Kossmann (1951), and Hebbert and Rankin (1954)-have emphasized the relatively large number of cases of mitral valve disease in elderly patients. Hammond and Platts (1960) have drawn attention to the numbers of patients over the age of 60 who were found at necropsy to have mitral valve disease.…”