1. Division of Epidemiology, University of Minnesota School of Public Health, and, Vascular Medicine Program, Minneapolis Heart Institute, Minneapolis, MN, USA,
2. Division of Vascular Surgery, Gonda Vascular Center, Mayo Clinic, Rochester, MN, USA
3. Vascular and Interventional Associates, Fairfax Radiological Consultants, F airfax, VA, USA
4. Department of Vascular Surgery, London Health Sciences Centre, London, Ontario, Canada
5. Harvard Medical School, Brigham and Women’s Hospital, Boston, MA, USA