1. Second Neonatal Department and Neonatal Intensive Care Unit (NICU), Aristotle University of Thessaloniki, “Papageorgiou” Hospital Thessaloniki Greece
2. Second Department of Pathology National and Kapodistrian University of Athens, "ATTIKON" University Hospital Athens Greece
3. Hematology Department – Hemostasis Unit “Papageorgiou” Hospital Thessaloniki Greece
4. First Paediatric Department Aristotle University of Thessaloniki Thessaloniki Greece
5. Second Paediatric Department Aristotle University of Thessaloniki Thessaloniki Greece
6. First Department of Pediatric Surgery, Faculty of Medicine Aristotle University of Thessaloniki, “G. Genimatas” Hospital Thessaloniki Greece