1. Pediatric Respiratory and Allergy Unit; “Virgen de la Arrixaca” University Children's Hospital, University of Murcia; Murcia Spain
2. Pediatric Respiratory Unit; “Los Arcos del Mar Menor” University Hospital; San Javier Spain
3. Pediatric Emergency Unit; Canarias Children's hospital. Las Palmas de Gran Canaria; Spain
4. Pediatric Emergency Unit; San Joan de Déu hospital; Barcelona Spain
5. Pediatric Emergency Unit; “Gregorio Marañón” General University Hospital; Madrid Spain
6. Pediatric Emergency Unit; “Son Espases” University Hospital; Palma de Mallorca Spain
7. Pediatric Emergency Unit; Donostia University Hospital; San Sebastián Spain
8. Pediatric Emergency Unit; “Cruces” University Hospital; Bilbao Spain
9. Pediatric Emergency Unit; “Virgen del Rocío” University Hospital; Sevilla Spain
10. Pediatric Emergency Unit; “Miguel Servet” University Hospital; Zaragoza
11. Pediatric Emergency Unit; Cabueñes Hospital; Gijón Spain
12. Pediatric Emergency Unit; Asturias Central University Hospital; Oviedo Spain