1. From the Division of Cardiology, Cliniques Universitaires Saint-Luc and Pole of Cardiovascular Research, Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain, Brussels, Belgium (A.P.)
2. Harrington Heart and Vascular Institute, University Hospitals Cleveland Medical Center (H.L.G.)
3. Department of Medicine, Case Western Reserve University, Cleveland, OH (H.L.G.).