1. Department of Surgery Johns Hopkins University School of Medicine Baltimore Maryland USA
2. Brigham and Women's Hospital Heart and Vascular Center Harvard Medical School Boston Massachusetts USA
3. National Kapodistrian University of Athens Zografou Greece
4. Division of Cardiology New York Presbyterian Hospital Columbia University Irving Medical Center New York New York USA
5. Division of Cardiology Medical University of South Carolina Charleston South Carolina USA
6. Division of Cardiac Surgery Johns Hopkins University School of Medicine Baltimore Maryland USA
7. Division of Cardiovascular Medicine Section of Heart failure and Transplantation University of Iowa Iowa USA