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