1. Division of Pediatric Hematology-Oncology, First Department of Pediatrics, National and Kapodistrian University of Athens, “Aghia Sophia” Children’s Hospital, Athens, Greece
2. Immunology – Histocompatibility Department, “Aghia Sophia” Children's Hospital, Athens, Greece
3. Department of Laboratory Hematology, Athens Regional General Hospital “G. Gennimatas”, Athens, Greece