1. From the Division of Cardiovascular Sciences (B.L., A.G., J.B., J.D.), Centre for Applied Medical Research, University of Navarra, Pamplona, Spain; Division of Cardiology (R.Q.), Donostia University Hospital, San Sebastián, Spain; Division of Hemodynamics (M.L.), Guipuzcoa Polyclinics, San Sebastián, Spain; and Department of Cardiology and Cardiovascular Surgery (J.D.), University Clinic of Navarra, Pamplona, Spain.