1. From the Johns Hopkins Ciccarone Center for Prevention of Cardiovascular Disease (S.A., S.M.I.U., A.D.O., O.H.O., M.J.B., O.D.) and Russell H. Morgan Department of Radiology and Radiological Science (O.D.), Johns Hopkins University School of Medicine, 600 N Wolfe St, Blalock 524, Baltimore, MD 21287; Department of Medicine, MedStar Union Memorial Hospital, Baltimore, Md (A.D.O.); and Department of Radiology and Neuroradiology, Charité, Berlin, Germany (S.A., O.D.).