1. Department of Allergy, University Hospital Fundación Jiménez Díaz, Madrid, Spain
2. Centro de investigación biomédica en enfermedades respiratorias (CIBERES), Instituto Carlos III, Madrid, Spain
3. Department of Allergy, University Hospital of Virgen del Rocío, Sevilla, Spain
4. Department of Allergy, Hospital Universitario 12 de Octubre, Madrid, Spain
5. Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Madrid, Spain
6. Department of Allergy, Hospital Universitario Fundación Alcorcón, Madrid, Spain
7. Department of Allergy, Hospital Universitario de Fuenlabrada, Madrid, Spain
8. RETIC ARADyAL, Instituto de Salud Carlos III, Madrid, Spain
9. Department of Allergy, Hospital Clinico San Carlos (HCSC)
10. Instituto de investigación sanitaria del Hospital Clínico San Carlos (IdSSC), Madrid, Spain
11. Department of Allergy, Complejo Hospitalario de Toledo, Toledo, Spain
12. Department of Allergy, Hospital Universitario Puerta de Hierro Majadahonda, Madrid, Spain
13. Department of Allergy, Hospital Universitario del Sureste, Madrid, Spain
14. Research and Science Support Unit, Instituto de investigación Biomédica del Hospital Universitario, Madrid, Spain
15. Department of Allergy, La Paz University Hospital, Institute for Health Research (IdiPAZ), Madrid, Spain