1. European Hidradenitis Suppurativa Foundation Dessau Germany
2. Faculty of Medicine Universitaetsklinikum Hamburg‐Eppendorf (UKE) Hamburg Germany
3. Department of Dermatology Centro Hospitalar de Vila Nova de Gaia/Espinho Vila Nova de Gaia Portugal
4. Departments of Dermatology, Venereology, Allergology and Immunology, Staedtisches Klinikum Dessau Brandenburg Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg Dessau Germany
5. Department of Dermatology Erasmus University Medical Center Rotterdam Netherlands
6. Department of Dermatology, Venereology and Allergology Wroclaw Medical University Wroclaw Poland
7. Department of Dermatology Nordland Hospital Trust Bodø Norway