1. Allergy Unit; Department of Dermatology; University Hospital; Zürich Switzerland
2. Thermo Fisher Scientific; Uppsala Sweden
3. Allergy Department; Hospital Clinico San Carlos; IdISSC; Madrid Spain
4. Department of Clinical Immunology; Royal Free Hospital and University College; London UK
5. Division of Biostatistics; Paul-Ehrlich-Institut; Langen Germany
6. Division of Allergology; Paul-Ehrlich-Institut; Langen Germany
7. Manchester Royal Infirmary; Manchester UK
8. Department of Dermatology/Allergology; University Medical Center; Utrecht The Netherlands
9. Allergy Department; 2nd Pediatric Clinic; University of Athens; Athens Greece
10. Centre for Paediatrics and Child Health; Institute of Human Development; University of Manchester; Manchester UK
11. Pediatric Department; Faculty Hospital Bulovka; Prague Czech Republic
12. Clinic of Allergy & Asthma; Medical University of Sofia; Sofia Bulgaria
13. Allergy division; Chest disease department; University Hospital of Strasbourg; Strasbourg France
14. Department of Allergy; Respiratory Medicine and Sleep; Landspitali University Hospital; Reykjavík Iceland
15. Department of Immunology, Rheumatology and Allergy; Faculty of Medicine; Medical University of Lodz; Lodz Poland
16. Ambulatorio di Allergologia; Clinica San Carlo; Paderno Dugnano Italy
17. Medical Faculty Vilnius University; Vilnius Lithuania
18. Clinical Epidemiology Unit; Preventive Medicine Department; Hospital Clinico San Carlos; IdISSC; Madrid Spain
19. Institute of Inflammation and Repair and Manchester Institute of Biotechnology; Manchester Academic Health Sciences Centre; The University of Manchester; Manchester UK
20. Department of Experimental Immunology and Department of Otorhinolaryngology; Academic Medical Center of the University of Amsterdam; Amsterdam The Netherlands