1. Division of Evidence Based Medicine; Department of Dermatology; Charité - Universitätsmedizin Berlin; Berlin Germany
2. Section of Dermatology and Venereology; Department of Medicine; University of Verona; Verona Italy
3. Department of Dermatology; Aberdeen Royal Infirmary; Aberdeen UK
4. Service de Dermatologie; Hôpital Ambroise Paré Université Paris V; Boulogne France
5. Clinical Lead for Dermatology; St Johns Institute of Dermatology; St Thomas' Hospital; London UK
6. Department of Dermatology; Academic Medical Center; Amsterdam The Netherlands
7. Third Faculty of Medicine; Department of Dermatology; Charles University; Prague Czech Republic
8. Department of Dermatology; Hôpital Saint-Louis; Paris France
9. St. Johns Institute of Dermatology; St. Thomas' Hospital; London UK
10. Hospital Universitario de la Princesa; Madrid Spain
11. University Medical Center Nijmegen St Radboud; Nijmegen The Netherlands
12. Medizinische Klinik mit Schwerpunkt Rheumatologie u. klinische Immonologie; Charité - Universitätsmedizin Berlin; Berlin Germany
13. Cambridge UK
14. SZTE Borgyogyaszati Klinika; Szeged Hungary
15. Roma Italy
16. Department of Dermatology; Psoriasis-Center University Medical Center Schleswig Holstein; Kiel Germany
17. Waterloo Canada
18. Department of Dermatology; Paul Sabatier University; Toulouse France
19. Dermatologikum Hamburg; Hamburg Germany
20. Section of Dermatology and Venereology; Department of Medicine; Karolinska Institutet; Karolinska University Hospital; Huddinge Stockholm Sweden
21. Department of Dermatology; Erasmus University; Rotterdam The Netherlands
22. Department of Dermatology; University Hospital Nijmegen; Nijmegen The Netherlands
23. Department of Dermatology; Inselspital; Universitätsklinik für Dermatologie; Bern Switzerland