1 Neonatal Intensive Care Unit, "Agios Panteleimon" General Hospital of Nikea, Piraeus, Greece.
2 Department of Biomedical Sciences, Humanitas University, Milan, Italy.
3 Humanitas Clinical and Research Center-IRCCS, Milan, Italy.
4 Laboratory of Haematology and Blood Bank Unit, "Attiko" Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.
5 Neonatal Intensive Care Unit, University Hospital of Larissa, Larissa, Greece.
6 Neonatal Department, Aretaeio Hospital, National and Kapodistrian University of Athens, Athens, Greece.
7 Laboratory of Reliability and Quality Control in Laboratory Hematology, Department of Biomedical Science, School of Health and Caring Science, University of West Attica, Egaleo, Greece.
8 Department of Blood Transfusion, Aretaieion Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.
9 Intensive Care Unit, Excela Health Westmoreland Hospital, Greensburg, Pennsylvania, United States.