1. Department of Dermatology and Allergology University Medical Center Utrecht Utrecht The Netherlands
2. National Heart and Lung Institute Imperial College London London UK
3. Allergy Department Hospital Clinico San Carlos IdISSC ARADyAL, RD16/0006/0009 Madrid Spain
4. Allergy Unit Department of Dermatology University Hospital of Zürich Zürich Switzerland
5. Faculty of Medicine University of Zürich Zürich Switzerland
6. Clinic for Dermatology and Allergology Kantonsspital St. Gallen St. Gallen Switzerland
7. Clinical Epidemiology Unit Preventive Medicine Department Hospital Clinico San Carlos IdISSC Madrid Spain
8. Department of Paediatric Pulmonology University Children's Hospital Zürich Switzerland
9. Children's Hospital Landspitali University Hospital Reykjavik Iceland
10. Medical Faculty Vilnius University Vilnius Lithuania
11. Department of Immunology, Rheumatology and Allergy Faculty of Medicine Medical University of Lodz Lodz Poland
12. Clinical Centre of Allergology of the Alexandrovska Hospital Medical University of Sofia Sofia Bulgaria
13. Saxion University of Applied Sciences Deventer The Netherlands
14. Allergy Department 2nd Pediatric Clinic University of Athens Athens Greece
15. Division of Infection, Immunity and Respiratory Medicine University of Manchester Manchester UK
16. University Hospital Sv. Ivan Rilski Sofia Bulgaria
17. Department of Experimental Immunology Amsterdam University Medical Center Amsterdam The Netherlands
18. Division of Internal Medicine and Dermatology University Medical Center UtrechtUtrecht University The Netherlands
19. Division of Infection, Immunity and Respiratory Medicine Manchester Institute of Biotechnology & Lydia Becker Institute of Immunology and Inflammation University of Manchester Manchester UK
20. Department of Otorhinolaryngology Amsterdam University Medical Center Amsterdam The Netherlands