1. Department of Allergy and Clinical Immunology; Clínica Universidad de Navarra; Pamplona Spain
2. Allergy Unit; Pneumology Department; Hospital Clinic; University of Barcelona; Barcelona Spain
3. Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS); Barcelona Spain
4. Dermatology Department; Hospital del Mar; Parc de Salut Mar; Universitat Autonoma Barcelona; Barcelona Spain
5. Allergy Department; Hospital Universitario Basurto; Bilbao Spain
6. Allergy Section; Medicine Department; Hospital Vall d'Hebron; Universitat Autònoma de Barcelona; Barcelona Spain
7. Dermatology Department; Hospital Universitario 12 de Octubre; Madrid Spain
8. Dermatology Department; Hospital General Universitario de Alicante; Alicante Spain
9. Allergy Department; Fundación Jiménez Diaz; Madrid Spain
10. Dermatology Department; Hospital Arnau de Vilanova; Valencia Spain
11. Allergy Unit; Pneumology and Respiratory Department; Hospital Clínic (ICT); University of Barcelona; Barcelona Spain