1. Department of Dermatology Zealand University Hospital Roskilde Denmark
2. European Hidradenitis Suppurativa Foundation e.V Dessau Germany
3. Department of Dermatology, Hopital Erasme Université Libre de Bruxelles Brussels Belgium
4. Department of Dermatology University of Ferrara Ferrara Italy
5. Institute for Health Services Research in Dermatology and Nursing University Hospital Hamburg‐Eppendorf Hamburg Germany
6. Department of Dermatology, Erasmus Medical Center University of Rotterdam Rotterdam Netherlands
7. Departments of Dermatology, Venereology, Allergollogy and Immunology, Dessau Medical Center Brandenburg Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg Dessau Germany