1. Department of Dermatology University of Michigan Ann Arbor Michigan USA
2. European Hidradenitis Suppurativa Foundation e.V. Dessau Germany
3. Department of Dermatology, Division of Infection & Immunity Cardiff University Cardiff UK
4. Institute for Health Care Services Research in Dermatology and Nursing University Hospital Medical Center Hamburg‐Eppendorf Hamburg Germany
5. Departments of Dermatology, Venereology, Allergology and Immunology, Dessau Medical Center Brandenburg Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg Dessau Germany