1. Department of Respiratory Epidemiology and Public Health, National Heart and Lung Institute, Imperial College London, London, UK
2. Institute of Food Research, Materials Science, Norwich, UK
3. Children’s Hospital Iceland, Landspitali, University Hospital, Reykjavík, Iceland
4. Clinics of Chest, Allergology and Radiology, Medical faculty, Vilnius University, Vilnius, Lithuania
5. Clinical Epidemiology Unit, Preventive Medicine Department. Hospital Clínico San Carlos, Madrid, Spain
6. Allergy Department, Hospital Clínico San Carlos, Madrid, Spain
7. University Medical Center Utrecht, Department of Dermatology/Allergology, Utrecht, the Netherlands
8. Department of Immunology, Rheumatology and Allergy, Faculty of Medicine, Medical University of Lodz, Poland
9. Phadia AB, Uppsala, Sweden
10. Allergy Unit, Department of Dermatology, University Hospital of Zürich, Switzerland
11. Medical University, Clinical Centre of Allergology of the Alexandrovska Hospital, Sofia, Bulgaria
12. Department of Experimental Immunology and Department of Otorhinolaryngology, Academic Medical Center, Amsterdam, the Netherlands
13. Allergy Department, 2nd Pediatric Clinic, University of Athens, Athens, Greece