1. Division of Neonatology Biocruces Health Research Institute University Hospital Cruces Barakaldo Spain
2. Division of Neonatology Health Research Institute i + 12 University Hospital 12 de Octubre Universidad Complutense Madrid Spain
3. Division of Neonatology University Hospital Gregorio Marañón Madrid Spain
4. Division of Neonatology Germans Trias i Pujol Hospital Badalona Spain
5. Division of Neonatology Hospital de Algeciras Cádiz Spain
6. Primary Care Paediatrician Health Care Center Goya Madrid Spain
7. Primary Care Paediatrician Health Care Center Fuensanta Valencia Spain
8. Division of Neonatology University Hospital 12 de Octubre Madrid Spain
9. Division of Neonatology Neonatal Research Group Health Research Institute La FeUniversity and Polytechnic Hospital La Fe Valencia Spain