1. Fraunhofer Institute for Translational Medicine and Pharmacology ITMP, Allergology and Immunology Berlin Germany
2. Institute of Allergology, Charité‐Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt‐Universität zu Berlin Berlin Germany
3. Department of Dermatology, Hospital del Mar, IMIM Universitat Pompeu Fabra Barcelona Spain
4. Department of Dermatology and Allergy University Hospital, RWTH Aachen Aachen Germany
5. Department of Dermatology University Hospital Muenster Muenster Germany
6. Department of Allergy Clinica Universidad de Navarra Pamplona Spain
7. RICORS Red De Enfermedades Inflamatorias (REI)‐RD21/0002/0028 Madrid Spain
8. Department of Dermatology University Medical Center Mainz Mainz Germany
9. Hospital of Dermatology Bad Rothenfelde Germany
10. Department of Dermatology and Allergy, University Medical Center Justus Liebig University Gießen Giessen Germany
11. Allergy Department, Hospital Universitario Vall d'Hebron, VHIR Universitat Autònoma de Barcelona Barcelona Spain
12. Department of Dermatology, Medical Center – University of Freiburg, Faculty of Medicine University of Freiburg Freiburg Germany
13. Department of Dermatology and Allergy University Medical Center Mainz Germany
14. Clinic for Dermatology and Allergology, Aachen Comprehensive Allergy Center (ACAC) Uniklinik RWTH Aachen Aachen Germany