[1] Univ N Carolina, Div Vasc Surg, Dept Surg, Chapel Hill, NC USA
[2] Boca Raton Reg Hosp, Boca Raton, FL USA
[3] Univ Penn, Dept Surg, Philadelphia, PA 19104 USA
[4] Eastern Virginia Med Sch, Norfolk, VA 23501 USA
[5] Massachusetts Gen Hosp, Dept Surg, Boston, MA 02114 USA