1. Neonatal Intensive Care Unit, “Agios Panteleimon” General Hospital of Nikea, Piraeus, Greece
2. Neonatal Intensive Care Unit, “Elena Venizelou” Maternity Hospital, Athens, Greece
3. Laboratory of Haematology and Blood Bank Unit, “Attiko” Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
4. Neonatal Department, Aretaeio Hospital, National and Kapodistrian University of Athens, Athens, Greece
5. Department of Biomedical Sciences, Humanitas University, Milan, Italy
6. IRCCS Humanitas Research Hospital, Milan, Italy