1. Department of Surgery Johns Hopkins University School of Medicine Baltimore Maryland USA
2. Department of Surgery Lahey Hospital and Medical Center Burlington MA USA
3. Cardiac Surgery Unit Department of Cardiac, Thoracic, Vascular Sciences and Public Health University of Padua Padua Italy
4. Medical School of Athens National and Kapodistrian University of Athens Athens Greece
5. Brigham and Women's Hospital Heart and Vascular Center Harvard Medical School Boston Massachusetts USA
6. Department of Thoracic and Cardiovascular Surgery Heart, Vascular, and Thoracic Institute Cleveland Clinic Cleveland Ohio USA
7. Division of Cardiology Columbia University Irving Medical Center New York City New York USA
8. Pediatric and Congenital Cardiac Surgery Unit Department of Cardiac Thoracic, Vascular Sciences and Public Health University of Padua Padua Italy
9. Department of Cardiology Montefiore Medical Center Albert Einstein College of Medicine New York City New York USA
10. Division of Cardiology Cleveland Clinic Foundation Cleveland Ohio USA
11. Division of Cardiovascular Medicine Section of Heart Failure and Transplantation University of Iowa Iowa City Iowa USA