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3. Two-dimensional echocardiographic assessment of mitral stenosis;Nichol, P.M.; Gilbert, B.W.; Kisslo, J.A.;Circulation,1977
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5. Rheumatic mitral valve stenosis: cross sectional echocardiographic analysis;Naito, M.; Morganroth, J.; Mardelli, T.J.; Chen, C.C.; Dreyfus, L.S.;Am Heart J,1980