1. Department of Dermatology Urticaria Center of Reference and Excellence (UCARE) Koç University School of Medicine Istanbul Turkey
2. Microbiology Department Faculty of Medicine Urticaria Center of Reference and Excellence (UCARE) Kuwait University Safat Kuwait
3. Department of Dermatology and Allergy Urticaria Center of Reference and Excellence (UCARE) Charité ‐ Universitätsmedizin Berlin Berlin Germany
4. Department of Dermatology Urticaria Center of Reference and Excellence (UCARE) Hospital del Mar IMIM Universitat Autònoma Barcelona Spain
5. Department of Dermatology Urticaria Center of Reference and Excellence (UCARE) Bispebjerg Hospital Copenhagen Denmark
6. Dermatology, and Immunology Urticaria Center of Reference and Excellence (UCARE) St James's Hospital Dublin Ireland
7. Department of Dermatology Urticaria Center of Reference and Excellence (UCARE) The Urticaria Clinic Salford Royal Foundation Trust University of Manchester Manchester UK
8. Aydın Adnan Menderes University Aydın Turkey
9. Urticaria Center of Reference and Excellence (UCARE) Faculdade de Medicina do ABC (FMABC Santo André Brazil
10. NRC Institute of Immunology FMBA of Russia Moscow Russia
11. First Moscow State Medical University Moscow Russia
12. Urticaria Center of Reference and Excellence (UCARE) Moscow Center of Allergy and Immunology Clinical Hospital 52 Ministry of Moscow Healthcare Moscow Russia
13. Dr. D.Y. Patil Medical College & Hospital Mumbai India
14. Allergy Research Center Mashhad University of Medical Sciences Mashhad Iran
15. Istanbul Faculty of Medicine Istanbul University Istanbul Turkey
16. Okmeydani Training and Research Hospital Istanbul Turkey
17. Federal University of São Paulo Sao Paulo Brazil
18. European Center for Diagnosis and Treatment of Urticaria (GA2LEN UCARE Network) Medical University of Silesia in Katowice Katowice Poland
19. The London Allergy & Immunology Centre London UK
20. Federal University of Rio de Janeiro Rio De Janeiro Brazil
21. The Centro Médico Vitae Buenos Aires Argentina
22. Department of Dermatology University Allergy Center University Hospital Carl Gustav Carus Technical University Dresden Dresden Germany
23. Department of Dermatology and Venerology Beijing Key Laboratory of Molecular Diagnosis on Dermatoses and National Clinical Research Center for Skin and Immune Diseases Peking University First Hospital Beijing China
24. Johannes Gutenberg‐UniversitätKöR Mainz Germany
25. CHU de Grenoble Alpes Grenoble France
26. Bezmialem University Istanbul Turkey
27. Department of Biostatistics Aksaray University School of Medicine Aksaray Turkey
28. Dermatological Allergology Allergie‐Centrum‐Charité Department of Dermatology and Allergy Urticaria Center of Reference and Excellence (UCARE) Charité – Universitätsmedizin Berlin Berlin Germany