One year hemodynamic performance of the Perimount Magna pericardial xenograft and the Medtronic Mosaic bioprosthesis in the aortic position: a prospective randomized study - Dalmau, M J; María González-Santos, J; López-Rodríguez, J; Bueno, M; Arribas, A; Nieto, F (Interact Cardiovasc Thorac Surg, 2007)