JOHNSON ML, HOLMES JH, PATON BD: Circulation 47: 1274, 1973. On page 1276, figure 2 was printed backwards. Correct figure is reproduced above. First line of legend should read "Echocardiogram from a patient with medium mitral Beall prosthesis. During ventricular systole the disc".
© 1973 American Heart Association, Inc.
Correction
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