1. Vascular Medicine Section, Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland, Ohio
2. Zena and Michael A. Wiener Cardiovascular Institute, Mt Sinai Medical Center, New York, New York
3. Michigan Cardiovascular Outcomes Research and Reporting Program, University of Michigan, Ann Arbor
4. Department of Surgery, Greenville Health System, Greenville, South Carolina
5. Cardiovascular Division, Vanderbilt University Medical Center, Nashville, Tennessee
6. Division of Cardiovascular Medicine, University of Virginia, Charlottesville
7. Vascular Center, Massachusetts General Hospital, Boston
8. Divison of Cardiology, Emory University, Atlanta, Georgia