Global citimpact: 4.04 Researcher at Cardiology Division, MedStar Heart Institute, MedStar Washington Hospital Center, 110 Irving Street, NW, Washington DC 20010, ; Cardiology Division, Medstar Georgetown University Hospital, Washington, DC, ; Cardiovascular and Pulmonary Branch, Advanced Cardiovascular Imaging Laboratory, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, . Electronic address: .