1. Division of Allergy and Immunology, Department of Dermatology, Venerology and Allergology, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt‐Universität zu Berlin Berlin Institute of Health Berlin Germany
2. Allergy Unit, Department of Dermatology University Hospital Basel Basel Switzerland
3. Allergy Unit Cantonal Hospital Aarau Aarau Switzerland
4. Department for Methodology and Research Infrastructure Robert Koch‐Institut Berlin Germany
5. Department of Dermatology and Allergology Ludwig‐Maximilian‐University Munich Germany
6. Allergy Vigilance Network Vandoeuvre les Nancy France
7. Department of Dermatology Saarland University Medical School Homburg/Saar Germany
8. Department of Dermatology, Venereology and Allergology and Leipzig Interdisciplinary Center of Allergology (LICA) Comprehensive Allergy Center University Leipzig Medical Faculty Leipzig Germany
9. Department of Clinical and Molecular Sciences Università Politecnica delle Marche Ancona Italy
10. Department of Internal Medicine/Allergy Unit University Hospital Ospedali Riuniti Ancona Italy
11. Department of Dermatology and Allergology Paracelsus Medizinische Privatuniversität Salzburg Salzburg Austria
12. Division of Allergy, Clinical Immunology and Rheumatology, Department of Pediatrics Federal University of São Paulo São Paulo Brazil
13. Faculty of Public Health Medical University – Sofia Sofia Bulgaria
14. Allergy Out‐patient Department Acibadem City Clinic, Tokuda Medical Centre Sofia Bulgaria
15. Allergy Section, Department of Internal Medicine Hospital Vall d'Hebron Barcelona Spain
16. ARADyAL Research Network Barcelona Spain
17. Department of Dermatology University Hospital Erlangen, Friedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU) Erlangen Germany
18. Department of Dermatology, Venereology and Allergology Medical University of Innsbruck Innsbruck Austria
19. Department of Dermatology Medical Center – University of Freiburg Freiburg Germany
20. Faculty of Medicine University of Freiburg Freiburg Germany
21. Department of Dermatology, Venereology and Allergology, St. Josef Hospital, University Medical Center Ruhr University Bochum Bochum Germany