1. Departments of Dermatology, Venereology, Allergology and Immunology Dessau Medical Center Brandenburg Medical School Theodor Fontane DessauGermany
2. European Hidradenitis Suppurativa Foundation e.V. Dessau Germany
3. Department of Dermatology, Venereology and Allergology Wroclaw Medical University Wroclaw Poland
4. Department of Dermatology Zealand University Hospital, Roskilde; Health Sciences Faculty, University of Copenhagen Denmark