1. Urticaria Center of Reference and Excellence (UCARE) Institute of Allergology Charité – Universitätsmedizin Berlin Corporate Member of Freie Universität Berlin and Humboldt‐Universität zu Berlin Berlin Germany
2. Fraunhofer Institute for Translational Medicine and Pharmacology ITMP, Allergology and Immunology Berlin Germany
3. Division of Pediatric Pulmonology, Allergy and Endocrinology Department of Pediatrics and Adolescent Medicine Comprehensive Center of Pediatrics Medical University of Vienna Vienna Austria
4. Department of Allergology Clinica San Carlo Paderno Dugnano, Milan Italy
5. Department of Allergy and Clinical Immunology Clinica Universidad de Navarra Instituto de Investigación Sanitaria de Navarra (IdiSNA) RETIC de Asma, Reacciones Adversas y Alérgicas (ARADYAL) Pamplona Spain
6. Department of Dermatology Hospital Del Mar IMIM Universitat Autònoma y Universitat Pompeu Fabra Barcelona Spain
7. St John's Institute of Dermatology Guy's Hospital London UK
8. Department of Dermatology and Allergology University Medical Center Giessen and Marburg Justus‐Liebig University Gießen Gießen Germany
9. Department of Allergy and Clinical Immunology 424 General Military Training Hospital Thessaloniki Greece
10. Department of Human Medicine and Health Sciences University Clinic of Dermatology and Allergy University of Oldenburg Oldenburg Germany
11. Department of Dermatology University Medical Center Mainz Mainz Germany
12. Allerdia Inc Los Angeles California USA
13. Department of Dermatology and Allergy Centre Odense University Hospital University of Southern Denmark Odense Denmark
14. Servicio de Alergia Instituto de Investigación Sanitaria (IIS)‐Hospital Universitario de La Princesa Madrid Spain
15. Department of Dermatology Medical University of Vienna Vienna Austria
16. Allergy Unit 2nd Department of Dermatology and Venereology Medical School National and Kapodistrian University of Athens “Attikon” University Hospital Athens Greece
17. Department of Dermatology Norfolk and Norwich University Hospital Norwich UK
18. Allergy Unit Department of Dermatology University Hospital Zürich Switzerland
19. Christine Kühne Center for Allergy Research and Education CK‐CARE Davos Switzerland
20. Division of Allergy and Clinical Immunology University of Toronto Toronto Ontario Canada
21. Faculty of Medicine Bnai‐Zion Medical Center Haifa Israel
22. Department of Dermatology and Venerology Kepler University Hospital Linz Austria