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APA Citation
Loperfido, F., Laurenzi, F., Gimigliano, F., Pennestri, F., Biasucci, L. M., Vigna, C., De Santis, F., Favuzzi, A., Rossi, E., & Manzoli, U. (1987). a comparison of the assessment of mitral valve area by continuous wave Doppler and by cross sectional echocardiography.. Heart, 57(4), 348–355. http://access.bl.uk/ark:/81055/vdc_100142950818.0x000026