1. Department of Respiratory Epidemiology and Public Health; National Heart and Lung Institute; Imperial College London; London UK
2. Institute of Inflammation and Repair; Manchester Institute of Biotechnology; Manchester UK
3. Children's Hospital Iceland; Landspitali, University Hospital; Reykjavik Iceland
4. Clinics of Chest, Allergology and Radiology; Medical faculty; Vilnius University; Vilnius Lithuania
5. Clinical Epidemiology Unit; Preventive Medicine Department; Hospital Clinico San Carlos; IdISSC; Madrid Spain
6. Allergy Department; Hospital Clinico San Carlos; IdISSC; Madrid Spain
7. Department of Dermatology/Allergology; University Medical Center Utrecht; Utrecht the Netherlands
8. Department of Immunology, Rheumatology and Allergy; Faculty of Medicine; Medical University of Lodz; Lodz Poland
9. Thermo Fisher Scientific; Uppsala Sweden
10. Allergy Unit; Department of Dermatology; University Hospital of Zurich; Zurich Switzerland
11. Swiss Tropical and Public Health Institute; Basel Switzerland
12. University of Basel; Basel Switzerland
13. Clinical Centre of Allergology of the Alexandrovska Hospital; Medical University; Sofia Bulgaria
14. Allergy Department; 2nd Pediatric Clinic; University of Athens; Athens Greece
15. Department of Experimental Immunology and Department of Otorhinolaryngology; Academic Medical Center; Amsterdam the Netherlands
16. Department of Pathophysiology and Allergy Research; Medical University of Vienna; Vienna Austria