1. Section of Vascular Medicine, Miller Family Heart and Vascular Institute, Cleveland Clinic Foundation, Cleveland, Ohio
2. Department of Internal Medicine, University of Chicago, Chicago, Illinois
3. Division of Vascular Surgery, Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland
4. Departments of Medicine and Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
5. Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania.