1. From the University of Illinois College of Medicine at Rockford, 1601 Parkview Ave, Rockford, IL 61107 (D.B.H., A.E.B.); Department of Interventional Radiology, University of California San Francisco, San Francisco, Calif (A.H.L., M.B.H.); and Department of Radiology, University of North Carolina, Chapel Hill, NC (M.P.K.).