1. University of South Carolina School of Medicine/Greenville; Greenville South Carolina
2. Metro Heart & Vascular Center; Metro Health Hospital; Wyoming Michigan
3. Loyola University, Maywood, IL and Hines VA; Hines Illinois
4. MGH Institute for Heart, Vascular and Stroke Care, Harvard University, Boston, Massachusetts
5. John Ochsner Heart & Vascular institute, Ochsner Medical Center; New Orleans Louisiana