1. Epidemiology and Statistics Research Center/CRESS INSERMINRAUniversity of Paris Paris France
2. Department of Neonatal Medicine Cochin‐Port Royal Hospital FHU PREMAAPHP Paris France
3. Department of neonatology Saint Vincent de Paul Hospital GHICL Lille France
4. Clinical Research Unit Center for Clinical Investigation P1419 APHP Paris France
5. Department of neonatology Jeanne de Flandre Hospital Lille CHRU Lille France
6. Lille UniversityLille CHRUULR 2694 ‐ METRICS Lille France