1. From the Cardiovascular Division, Department of Medicine, Vascular Medicine and Atherosclerosis Unit (E.L.H., G.K.S., P.L.), and Division of Vascular Surgery, Department of Surgery (A.D.W., J.K.), Brigham and Women’s Hospital, Harvard Medical School, Boston, Mass, and the Cardiovascular and Pulmonary Research Institute, Allegheny University of the Health Sciences, Pittsburgh, Pa (Y.-J.G.).