1. European Hidradenitis Suppurativa Foundation e.V. Dessau Germany
2. Departments of Dermatology, Venereology, Allergology and Immunology, Staedtisches Klinikum Dessau Brandenburg Medical School Theodor Fontane and Faculty of Health Sciences Dessau Germany
3. Department of Dermatology, Faculty of Medicine University of Ljubljana Ljubljana Slovenia
4. Department of Dermatology Universitaet Transilvania Brașov Romania
5. Department of Dermatology and Venereology Hospital de Braga Braga Portugal
6. Serviço de Dermatovenereologia Centro Hospitalar Universitário do Porto Porto Portugal
7. Department of Dermatology Centro Hospitalar de Vila Nova de Gaia/Espinho Vila Nova de Gaia Portugal
8. Sağlık Bakanlığı‐Turkish Ministry of Health Istanbul Turkey
9. Department of Dermatology I.M. Sechenov First Moscow State Medical University Moscow Russia
10. Department of Dermatology Erasmus University Medical Center Rotterdam Netherlands
11. Department of Dermatology, Venereology and Allergology Wroclaw Medical University Wroclaw Poland
12. Clinic of Dermatovenerology Ss. Cyril and Methodius University Skopje North Macedonia
13. Department of Dermatology Nordland Hospital Trust Bodø Norway
14. Universitaetsklinikum Hamburg‐Eppendorf (UKE) Faculty of Medicine Hamburg Germany