1. Neonatal Intensive Care Unit, CHI Créteil, CRETEIL, France
2. INSERM, U1153, Obstetrical, Perinatal and Pediatric Epidemiology Team, Epidemiology and Biostatistics Sorbonne, Paris Descartes University, France
3. Pediatric and Neonatal Intensive Care Unit, CHU Toulouse, Toulouse, France
4. Neonatal Intensive Care Unit, Hospices civils de Lyon, Lyon, France
5. Neonatal Intensive Care Unit, CHU Amiens, Amiens, France
6. Neonatal Intensive Care Unit, CHU Caen, Caen, France
7. Neonatal Intensive Care Unit, CHU Tours, Tours, France
8. Neonatal Intensive Care Unit, CHU Rennes, Rennes, France
9. Clinical Research Center, CHI Créteil, Créteil, France
10. ACTIV, St Maur, France
11. IMRB- GRC GEMINI, Université Paris Est, Créteil, France
12. INSERM, U1153, METHODS Team, Epidemiology and Statistics Sorbonne Paris Cité Research Center, Paris Descartes University, Hotel-Dieu Hospital (AP-HP), France.