1. Department of Dermatology; Zealand University Hospital; Roskilde Denmark
2. Health Sciences Faculty; University of Copenhagen; Copenhagen Denmark
3. Musculoskeletal Statistics Unit; The Parker Institute; Bispebjerg and Frederiksberg Hospital; Copenhagen Denmark
4. Institute of Infection & Immunity; Cardiff University; University Hospital of Wales; Heath Park Cardiff U.K
5. The Patients’ Association HS Denmark; Copenhagen Denmark
6. Department of Dermatology; Penn State Hershey Medical Center; Hershey PA U.S.A
7. Department of Dermatology; New York Medical College; Valhalla NY U.S.A
8. Harvard Medical School; Boston MA U.S.A
9. Department of Dermatology; Division of Rheumatology; Brigham and Women's Hospital; Boston MA U.S.A
10. Department of Medicine; Division of Rheumatology; Brigham and Women's Hospital; Boston MA U.S.A
11. Dermatology Service; US Department of Veteran Affairs Medical Centre; Denver CO U.S.A
12. Department of Rheumatology; Odense University Hospital; Odense Denmark
13. Department of Dermatology; Hofstra Northwell School of Medicine; New Hyde Park NY U.S.A