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La Canna, G., Maisano, F., De Michele, L., Grimaldi, A., Grassi, F., Capritti, E., De Bonis, M., & Alfieri, O. (2009). determinants of the degree of functional aortic regurgitation in patients with anatomically normal aortic valve and ascending thoracic aorta aneurysm. Transoesophageal Doppler echocardiography study. Heart, 95(2), 130–136. http://access.bl.uk/ark:/81055/vdc_100135151539.0x000019