1. Dermatology Section, Department of Health Sciences University of Florence Florence Italy
2. European Hidradenitis Suppurativa Foundation Dessau Germany
3. Departments of Dermatology, Venerology, Allergology and Immunology, Dessau Medical Center Brandenburg Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg Dessau Germany
4. 4th Department of Internal Medicine National and Kapodistrian University of Athens, Medical School Athens Greece
5. Department of Dermatology, Venereology and Allergology Wroclaw Medical University Wroclaw Poland