1. Section of Cardiovascular Medicine New Haven CT USA
2. Center for Outcome Research & Evaluation (CORE)Yale University School of Medicine New Haven CT USA
3. Inova Heart & Vascular Institute Falls Church VA USA
4. Klinik für Innere Medizin IIIUniversitätsklinikum des Saarlandes Homburg Germany
5. Division of Cardiology, School of MedicineUniversity of Colorado Aurora CO USA
6. San Francisco Veterans Affairs Medical CenterUniversity of California San Francisco San Francisco CA USA
7. Cardiovascular and Cell Sciences Research InstituteSt George's University of London London UK
8. Vanderbilt Heart and Vascular Institute Nashville TN USA