| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be explained and other advantages and features will appear with reference to the accompanying schematical drawings wherein: FIGS. 1 a, 1 b and 1 c illustrate, in section views, respectively, the normal aortic valve in systole, in diastole and a stenosed aortic valve; FIGS. 2 a and 2 b illustrate two examples of a metallic frame which are com
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