The effective orifice area/patient aortic annulus area ratio: a better way to compare different bioprostheses? A prospective randomized comparison of the Mosaic and Perimount bioprostheses in the aortic position. - Eichinger WB; Botzenhardt F; Guenzinger R; Bleiziffer S; Keithahn A; Bauernschmitt R; Lange R (The Journal of heart valve disease, 2004)