1. Department of Dermatology and Allergology Charite‐Universitätsmedizin Berlin Berlin Germany
2. Allergy Vigilance Network University Hospital Nancy Nancy France
3. Department of Internal Medicine/Allergy Unit University Hospital Ospedali Riuniti Ancona Italy
4. Allergy Section, Department of Internal Medicine Hospital Universitari Vall d'Hebron Barcelona Spain
5. Department of Dermatology University Hospital Basel Basel Switzerland
6. Division of Allergology University Children's Hospital Zurich Switzerland
7. Department of Dermatology University Allergy Center University Hospital Carl Gustav Carus Technical University Dresden Dresden Germany
8. Faculty of Public Health Medical University‐Sofia Sofia Bulgaria
9. Tokuda Medical Centre Allergy Out‐patient Clinic Sofia Bulgaria
10. Department of Pediatrics Jagiellonian University Medical College Krakow Poland
11. Department of Dermatology Paracelsus Private Medical University Salzburg Salzburg Austria
12. Paediatrics and Child Health University College Cork Cork Ireland
13. Department of Pediatrics St. Marien‐Hospital Bonn Germany
14. Department of Dermatology University Hospital of Erlangen Friedrich‐Alexander‐University Erlangen Erlangen Germany
15. Department of Mother and Child Health Padua General University Hospital Padua Italy
16. Allergy Department University of Athens Athens Greece
17. Department of Dermatology Saarland University Hospital Homburg/Saar Germany
18. Clinical Allergology Department Pomeranian Medical University Szczecin Szczecin Poland
19. Department of Dermatology and Allergology Klinikum der Universität München München Germany
20. Department of Pediatric Pneumology and Allergology Lung Centre South‐West Wangen Germany
21. Department of Dermatology, Venerology and Allergology LICA‐Comprehensive Allergy Center Universität Leipzig Leipzig Germany
22. Allergy Department Hospital Clinico San Carlos IdISSC Madrid Spain