1. European Hidradenitis Suppurativa Foundation (EHSF) Dessau Germany
2. Departments of Dermatology, Venereology, Allergology and Immunology Staedtisches Klinikum Dessau, Brandenburg Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg Dessau Germany
3. Department of Dermatology Erasmus University Medical Center Rotterdam Rotterdam The Netherlands
4. Department of Dermatology University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
5. Hidradenitis Suppurativa Unit, Instituto de Investigación Biosanitaria ibs and Servicio de Dermatologia Hospital Universitario Virgen de Las Nieves Granada Spain
6. Section of Dermatology and Infectious Diseases, Department of Medical Sciences University of Ferrara Ferrara Italy
7. Department of Dermatology University of Pisa Pisa Italy
8. Department of Dermatology, Venereology and Allergology Wroclaw Medical University Wrocław Poland
9. Novartis Pharma AG Basel Switzerland
10. Novartis Ireland Limited Dublin Ireland
11. Novartis Pharmaceuticals Corporation East Hanover New Jersey USA
12. Department of Dermatology Nordland Hospital Trust Bodø Norway