1. Department of Dermatology Erasme Hospital Université Libre de Bruxelles Brussels Belgium
2. ResoVerneuil Paris France
3. European Hidradenitis Suppurativa Foundation e.V. Europe
4. Department of Dermatology Erasmus University Medical Center Rotterdam the Netherlands
5. Department of Dermatology Alicante University General Hospital Alicante Institute for Health and Biomedical Research (ISABIAL‐FISABIO Foundation) Alicante Spain
6. 2nd Department of Dermatology and Venereology ‘Attikon’ General University Hospital National and Kapodistrian University of Athens Athens Greece
7. Department of Dermatology University of Pisa Pisa Italy
8. Department of Dermatology, Venereology and Oncodermatology University of Pécs Medical School Pécs Hungary
9. Departments of Dermatology, Venereology, Allergology and Immunology Dessau Medical Center Brandenburg Medical School Theodore Fontane Dessau Germany
10. Department of Dermatology Andreas Syggros Hospital Athens Greece
11. Department of Dermatology York Dermatology Center Richmond Hill ON U.S.A.
12. Department of Dermatology Sir Paul Boffa Hospital Floriana Malta
13. Department of Dermatology, Allergology and Venereology Wroclaw Medical University Wroclaw Poland
14. Department of Dermatology Epworth Hospital University of Melbourne Melbourne Australia
15. Department of Dermatology Hospital de Baza Granada Spain
16. Institute of Pathology Charité‐Universitaetsmedizin Berlin Berlin Germany
17. Private Practice Paris, France
18. Department of Dermatology Geisel School of Medicine at Dartmouth Manchester NH U.S.A.
19. Hospital de la Santa Creu i Sant Pau Autonomous University of Barcelona Barcelona Spain
20. Department of Dermatology Zealand University Hospital Health Sciences Faculty University of Copenhagen Copenhagen Denmark
21. Department of Surgery Clinique du Val d'Ouest Ecully France