1. From the Department of Radiology, Division of Interventional Radiology, Northwestern University Feinberg School of Medicine, 676 N St. Clair St, Ste 800, Chicago, IL 60611 (C.J.N., A.C.G., K.R.D.); and Departments of Interventional Cardiology (C.M.H.) and Vascular Medicine (C.M.H., R.K.), Ohio Health/Riverside Methodist Hospital, Columbus, Ohio.