1. European Hidradenitis Suppurativa Foundation e.V. Dessau Germany
2. Department of Dermatology Hôpital ErasmeUniversité Libre de Bruxelles Brussels Belgium
3. Department of Dermatology Institut Jules Bordet Université Libre de Bruxelles Brussels Belgium
4. Department of Dermatology University Hospital of North Norway Troms Norway
5. Departments of Dermatology, Venereology, Allergology and Immunology Dessau Medical Center Dessau Germany
6. Department of Dermatology Health Sciences Faculty Roskilde Hospital University of Copenhagen Copenhagen Denmark