1. Division of Dermatology, McGill University Health Centre, Montreal General Hospital, Montreal, Quebec, Canada
2. Faculty of Medicine, McGill University, Quebec, Quebec, Canada
3. Division of Dermatology, Memorial University of Newfoundland, St John’s, Newfoundland, Canada
4. Departments of Dermatology, Venereology, Allergology and Immunology, Dessau Medical Center, Brandenburg Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg, Dessau, Germany
5. European Hidradenitis Suppurativa Foundation e.V., Dessau, Germany