1. Department of Dermatology Zealand University Hospital Roskilde/Health Sciences Faculty, University of Copenhagen Copenhagen Denmark
2. Musculoskeletal Statistics Unit The Parker Institute, Bispebjerg and Frederiksberg Hospital The Capital Region of Denmark Copenhagen Denmark
3. Department of Dermatology Zucker School of Medicine at Hofstra/Northwell Hempstead NY U.S.A.
4. Dermatology and Venereology University of Ferrara Ferrara Italy
5. Department of Dermatology & Academic Wound Healing Cardiff University Cardiff U.K.
6. Department of Dermatology Hopital Erasme, Brussels, Université Libre de Bruxelles Brussels Belgium
7. Department of Dermatology, Venereology and Allergology Medical University Wrocław Poland
8. Department of Dermatology Hospital General Universitario de Alicante Alicante Spain
9. 11 chaussée de la muette 75016 Paris France
10. Department of Dermatology Stockholm South General Hospital (Södersjukhuset) Stockholm Sweden
11. Department of Clinical Science and Education Karolinska Institutet Stockholm Sweden
12. Department of Dermatology Faculty of Health Sciences University Hospital of North Norway Tromso Norway
13. Department of Dermatology Erasmus University Medical Center Rotterdam the Netherlands
14. Departments of Dermatology, Venereology, Allergology and Immunology Dessau Medical Center Brandenburg Medical School Theodor Fontane Dessau Germany
15. Department of Dermatology ICahn School of Medicine at Mount Sinai New York NY U.S.A.
16. Department of Rheumatology Odense University Hospital Odense Denmark