1. Department of Cardiovascular Medicine Heart, Vascular, and Thoracic Institute, Cleveland Clinic Cleveland Ohio USA
2. Division of Heart failure and Cardiac Transplantation Cleveland Clinic Cleveland Ohio USA
3. Department of Internal Medicine Vanderbilt University Medical Center Nashville Tennessee USA
4. Department of Cardiothoracic Surgery Brown University Providence Rhode Island USA
5. Division of Heart Failure and Transplant University of Iowa Hospitals and Clinics Iowa Iowa USA
6. National Kapodestrian University of Athens, Medical School