1. Division of Neonatology La Fe University and Polytechnic Hospital Valencia Spain
2. Pediatric Pulmonology Unit San Carlos University Hospital Madrid Spain
3. Pediatric Pulmonology Unit Severo Ochoa University Hospital Leganés, Madrid Spain
4. Pediatric Pulmonology and Cystic Fibrosis Unit Vall d'Hebron Hospital Barcelona Spain
5. Pediatric Pulmonology Unit Nuestra Señora de la Candelaria University Hospital Santa Cruz de Tenerife Spain
6. Pediatric Pulmonology Unit Hospital Universitario Materno Infantil de Canarias Las Palmas de Gran Canaria Las Palmas Spain
7. Pediatric Pulmonology and Allergy Unit 12th of October University Hospital Madrid Spain
8. Pediatric Pulmonology, Allergology and Immunology Unit, Cystic Fibrosis Unit Consorci Corporació Sanitària Parc Taulí Sabadell, Barcelona Spain
9. Pediatric Pulmonology Unit General University Hospital Gregorio Marañón Madrid Spain
10. Pediatric Pulmonology Unit Sant Joan de Deu Hospital Esplugues de Llobregat Barcelona Spain
11. Pediatric Pulmonology and Allergology Unit Complexo Hospitalario de Ourense Ourense Spain
12. Division of Neonatology Complexo Hospitalario de Ourense Ourense Spain