1. Department of Surgery Johns Hopkins University School of Medicine Baltimore Maryland USA
2. Division of Cardiology Medical University of South Carolina Charleston South Carolina USA
3. National Kapodistrian University of Athens Athens Greece
4. Division of Cardiology Montefiore Medical Center Bronx New York USA
5. Department of Cardiovascular Diseases Mayo Clinic Rochester Minnesota USA
6. Division of Cardiovascular Medicine, Section of Heart failure and Transplantation University of Iowa Iowa City Iowa USA