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3

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8

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9

Bornheimer, Joseph F., et al, ``Effects of Nitroglycerin on Supine and Upright Exercise in Mitral Stenosis,'' American Heart Journal, 104:1288-1293, 1982.

10

Truccone, Nestor J., Steeg, Carl N., Dell, Ralph, and Gersony, Welton M., ``Comparison of the Cardiocirculatory Effects of Exercise and Isoproterenol in Children with Pulmonary or Aortic Valve Stenosis,'' Circulation, 56:79-82, 1977.

11

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12

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