1. Division of Vascular Surgery, University of Tennessee at Chattanooga, 979 East Third Street, Suite C-300, Chattanooga, TN 37404, USA
2. Division of Vascular Surgery, Brown University, Two Dudley Street, Suite 470, Providence, RI 02905, USA
3. Division of Vascular Surgery, Northwestern University and Jesse Brown Veterans Affairs Medical Center, 676 N. Saint Clair Street, Suite 650, Chicago, IL 60611, USA