1. From the Section of Cardiovascular Medicine, University of Wisconsin Medical School (J.H.S., P.S.D.), Madison, Wis; Tulane Center for Cardiovascular Health and Department of Epidemiology (S.R.S., S.L., W.C., G.S.B.), Tulane University Health Sciences Center, New Orleans, La; Division of Vascular Ultrasound Research (M.G.B., R.T.), Wake Forest University School of Medicine, Winston-Salem, NC.