1. Flow Cytometry Laboratory, Department of ImmunologyAthens Regional General Hospital “G. Gennimatas,” Athens Greece
2. Department of Pediatric Hematology‐Oncology“Aghia Sophia” Children's Hospital Athens Greece
3. Department of Pediatric Hematology and OncologyCharles University, 2nd Faculty of Medicine and Faculty Hospital Motol, Prague Czech Republic
4. 1st Department of PediatricsAristotle University of Thessaloniki, Hippokration Hospital Thessaloniki Greece