1. Department of Pediatric Hematology-Oncology, University Hospital of Heraklion, School of Medicine, University of Crete, 71003 Heraklion, Greece
2. Department of Pediatrics, University Hospital of Ioannina, Faculty of Medicine, School of Health Sciences, University of Ioannina, 45110 Ioannina, Greece
3. Laboratory of Medical Genetics, “Aghia Sophia” Children’s Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
4. Division of Pediatric Hematology-Oncology, First Department of Pediatrics, “Aghia Sofia” Children’s Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece