1. Neonatal Department, School of Medicine, National and Kapodistrian University of Athens, Aretaieio Hospital, Athens, Greece
2. Neonatal Intensive Care Unit, “Agios Panteleimon” General Hospital of Nikaia, Piraeus, Greece
3. Laboratory of Haematology and Blood Bank Unit, School of Medicine, National and Kapodistrian University of Athens, “Attiko” Hospital, Athens, Greece
4. Second Department of Pathology, University General Hospital Attikon, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece