1. Department of Neonatal and Pediatric Intensive Care, Centre Hospitalier du Luxembourg, Luxembourg, Luxembourg.
2. Department of Pediatrics Intensive Care Medecine, and Hôpital Robert Debré, Paris, France.
3. Department of Neonatology, Hôpital Cochin, Paris, France.
4. Department of Neonatology, Hôpital Robert Debré, Paris, France.
5. Department of Pediatrics Intensive Care Medecine, Hôpital Necker-Enfants Malades, Paris, France.