作者单位:NW Mem Hosp, Div Vasc Surg, Chicago, IL 60611 USA[1]Univ Florida, Vasc Surg Sect, Gainesville, FL USA[2]Dartmouth Hitchcock Med Ctr, Vasc Surg Sect, Lebanon, NH 03756 USA[3]Boston Med Ctr, Div Vasc Surg, Boston, MA USA[4]Univ Utah, Sch Med, Vasc Surg Sect, Salt Lake City, UT USA[5]