From the Department of Cardiology (R.Y., J.B., C.C., C.A., M.M., M.A.G.-F.), Unit of Experimental Medicine and Surgery (M.M.D.), and Department of Cardiovascular Surgery (H.R.-A.), Hospital General Universitario Gregorio Marañón, Madrid; Department of Mathematical Physics and Fluids, Facultad de Ciencias, Universidad Nacional de Educación a Distancia, Distancia (J.C.A.); and Department of Signal Theory and Communications, Universidad Carlos III de Madrid, Madrid (J.L.R.-A.), Spain. (2005-09-20時点)