1. Department of Surgery, Division of Vascular Surgery, Hospital of the University of Pennsylvania, Philadelphia, PA
2. Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA
3. Department of Radiology, Division of Nuclear Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA
4. Department of Surgery, Division of Vascular Surgery, Hospital of the University of Pennsylvania, 4 Silverstein Building, 3400 Spruce Street, Philadelphia, PA 19104