[1] Southmead Hosp, Dept Vasc Surg, Southmead Rd, Bristol BS10 5NB, Avon, England
[2] Tech Univ Munich, Klinikum Rechts Isar, Dept Vasc & Endovasc Surg, Munich, Germany
[3] Harvard Med Sch, Beth Israel Deaconess Med Ctr, Div Vasc & Endovasc Surg, Boston, MA 02115 USA