1 Division of Vascular and Endovascular Surgery, Department Surgery, University of California - Davis, Sacramento, CA, USA.
2 Section of Vascular Surgery and Endovascular Therapy, Department of Surgery, University of Chicago Medical Center, Chicago, IL, USA.
3 Section of Vascular Surgery and Endovascular Therapy, Department of Surgery, University of Chicago Medical Center, Chicago, IL, USA - rmilner@bsd.uchicago.edu.