1 Department of Dermatology, Penn State Milton S Hershey Medical Center, Hershey, PA, USA.
2 Department of Dermatology, Hospital de Manises, Valencia, Spain.
3 European Hidradenitis Suppurativa Foundation e.V., Dessau, Germany.
4 University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC, USA.
5 Novartis Pharma AG, Basel, Switzerland.
6 HS Ireland, Hidradenitis Suppurativa Association, County Clare, Ireland.
7 Danish Hidradenitis Suppurativa Patients' Association (HSDK), Copenhagen, Denmark.
8 Departments of Dermatology, Venereology, Allergology and Immunology, Staedtisches Klinikum Dessau, Brandenburg Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg, Dessau, Germany.