1. Division of Cardiology Columbia University Irving Medical Center New York New York USA
2. AiDEAS Tallinn Estonia
3. The Johns Hopkins Hospital and School of Medicine Baltimore Maryland USA
4. Division of Cardiovascular Medicine Radcliffe Department of Medicine, University of Oxford Oxford UK
5. Helen B. Taussig Heart Center, The Johns Hopkins Hospital and School of Medicine Baltimore Maryland USA
6. Department of Cardiovascular Sciences KU Leuven Leuven Belgium
7. Onassis Cardiac Surgery Center Athens Greece
8. Aristotle University Medical School Thessaloniki Greece
9. Department of Cardiovascular Medicine Cleveland Clinic Cleveland Ohio USA
10. National and Kapodistrian University of Athens Medical School Athens Greece