[1] Univ Copenhagen, Zealand Univ Hosp, Fac Clin Med, Dept Dermatol, Roskilde, Denmark
[2] Univ Copenhagen, Sect Biostat, Dept Publ Hlth, Copenhagen, Denmark
[3] Dessau Med Ctr, Brandenburg Med Sch Theodor Fontane, Dessau, Germany
[4] Fac Hlth Sci Brandenburg, Dept Dermatol, Dessau, Germany
[5] Fac Hlth Sci Brandenburg, Dept Venereol, Dessau, Germany
[6] Fac Hlth Sci Brandenburg, Dept Allergol & Immunol, Dessau, Germany
[7] Univ Libre Bruxelles, Dept Dermatol, Brussels, Belgium
[8] Erasmus MC, Dept Dermatol, Rotterdam, Netherlands
[9] European Hidradenitis Suppurat Fdn eV Dessau, Dessau, Germany