1. Department of Obstetrics,
2. Neonatology Unit, and
3. Department of Biostatistics, University of Lille North of France, CHRU Lille, France; and
4. Institute of Hematology and Transfusion, Jeanne de Flandre Hospital, CHRU of Lille, France;
5. Faculty of Medicine, University of Lille North of France, CHRU Lille, France