1. From the Cardiology Division (W.J.K.), Massachusetts General Hospital, Boston, Mass; Division of Hypertension and Cardiac Rehabilitation (L.T., T.R., J.A.S.), Department of Cardiovascular Diseases, University of Leuven, Leuven, Belgium; Department of Medicine (J.B.K.), University of Medicine and Dentistry, New Jersey-Robert Wood Johnson Medical School, New Brunswick, NJ.