1. Thalassemia and Sickle Cell Unit, Hippocration General Hospital, Athens, Greece
2. First Department of Cardiology, National and Kapodistrian University of Athens School of Medicine, Athens, Greece
3. First Department of Cardiology, Hippocration General Hospital Athens, University of Athens, Athens, Greece
4. Second Department of Internal Medicine, National and Kapodistrian University of Athens School of Medicine, Athens, Greece