1. Deparment of Neonatology, Puerta de Hierro-Majadahonda University Hospital, Majadahonda, Madrid, Spain. Pediatric Deparment Associate Professor, Autónoma University, Madrid, Spain
2. Deparment of Neonatology, Fuenlabrada University Hospital, Fuenlabrada, Madrid, Spain
3. Deparment of Neonatology, Getafe University Hospital, Getafe, Madrid, Spain
4. Deparment of Neonatology, Sant Joan de Deu University Hospital, Barcelona, Catalunya, Spain
5. Deparment of Psychiatry, Puerta de Hierro-Majadahonda University Hospital, Majadahonda, Madrid, Spain
6. Biostatistics Unit, Puerta de Hierro Biomedical Research Institute, CIBERESP, Madrid, Spain
7. Deparment of Neonatology, Severo Ochoa University Hospital, Leganes, Madrid, Spain
8. Deparment of Neonatology, La Paz University Hospital, Madrid, Spain
9. Deparment of Neonatology, 12 de Octubre University Hospital, Madrid, Spain
10. Deparment of Neonatology, Clínico San Carlos University Hospital, Madrid, Spain
11. Deparment of Neonatology, Fundación Jiménez Díaz University Hospital, Madrid, Spain
12. Deparment of Neonatology, Río Hortega University Hospital, Valladolid, Castilla y León, Spain
13. Deparment of Neonatology, Josep Trueta University Hospital, Girona, Catalunya, Spain
14. Department of Obstetrics, Puerta de Hierro-Majadahonda University Hospital, Madrid, Spain