1. European Hidradenitis Suppurativa Foundation e.V. Dessau Germany
2. Departments of Dermatology Venereology, Allergology and Immunology Dessau Medical Center Brandenburg Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg Dessau Germany
3. Department of Dermatology Liverpool Hospital Sydney NSW Australia
4. University of New South Wales Sydney NSW Australia
5. 4th Department of Internal Medicine Medical School National and Kapodistrian University of Athens Athens Greece
6. Department of Dermatology Zealand University Hospital Roskilde Denmark
7. Institute of Clinical Medicine Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark
8. Department of Dermatology Hôpital Erasme Universite Libre de Bruxelles Bruxelles Belgium
9. Dermatology Unit Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico Milan Italy
10. Department of Pathophysiology and Transplantation Università degli Studi di Milano Milan Italy
11. Department of Dermatology University of North Carolina at Chapel Hill Chapel Hill NC USA
12. Department of Dermatology NLSH University Hospital Bodø Norway
13. Department of Dermatology and Institute of Medical Immunology/Psoriasis Research and Treatment Center Charité‐University Medicine Berlin Germany
14. Laboratory for Experimental Immunodermatology Erasmus University Medical Center Rotterdam Rotterdam The Netherlands
15. Department of Dermatology Erasmus University Medical Center Rotterdam Rotterdam The Netherlands