1. Department of Pediatric Cardiothoracic Surgery, Onassis Cardiac Surgery Center, 17674 Athens, Greece
2. Department of Hematology and Blood Transfusion, Onassis Cardiac Surgery Center, 17674 Athens, Greece
3. Department of Cardiac Surgery, Faculty of Medicine, Attikon University Hospital, National Kapodistrian University of Athens, 15771 Athens, Greece
4. Second Department of Cardiology, Attikon Hospital, Athens Medical School, National Kapodistrian University of Athens, 15771 Athens, Greece
5. First Department of Surgery, Laikon General Hospital, Medical School, National Kapodistrian University of Athens, 15771 Athens, Greece