[1] Univ Maryland, Sch Med, Dept Diagnost Radiol & Nucl Med, Div Vasc & Intervent Radiol, Baltimore, MD 21201 USA
[2] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Div Vasc Imaging & Intervent,Dept Imaging, Boston, MA 02114 USA
[3] Harvard Univ, Beth Israel Deaconess Med Ctr, Sch Med, Dept Radiol, Boston, MA 02215 USA
[4] Lincoln Med Ctr, TVV, Framingham, MA 01702 USA