1. Departments of Dermatology, Venereology, Allergology and Immunology Dessau Medical Center Brandenburg Medical School Theodor Fontane Dessau Germany
2. European Hidradenitis Suppurativa Foundation e.V. Dessau Germany
3. Dermatology Department Erasme Hospital Université Libre de Bruxelles Brussels Belgium
4. Department of Dermatology Roskilde and Health Sciences Faculty University of Copenhagen Copenhagen Denmark
5. 2nd Department of Dermatology and Venereology “Attikon” General University Hospital Medical School National and Kapodistrian University of Athens Athens Greece
6. Department of Dermatology Erasmus University Medical Center Rotterdam Netherlands
7. 4th Department of Internal Medicine Medical School National and Kapodistrian University of Athens Athens Greece