1. Institute for Health Services Research in Dermatology and Nursing (IVDP); German Center for Health Services Research in Dermatology (CVderm); University Medical Center Hamburg-Eppendorf (UKE); Hamburg Germany
2. Department of Dermatology; Paul Sabatier University; Toulouse France
3. Hospital de la Santa Creu i Sant Pau; Universitat Autònoma de Barcelona; Barcelona Spain
4. University of Münster; Münster Germany
5. Department of Dermatology; Ghent University Hospital; Ghent Belgium
6. University of Rome; Rome Italy
7. Department of Dermatology; University of Verona; Verona Italy
8. Århus University; Århus Denmark
9. Janssen Cilag NV; Beerse Belgium
10. Janssen-Cilag BV; Tilburg The Netherlands
11. Janssen Pharmaceutica NV; Moscow Russia
12. St John's Institute of Dermatology; King's College; London UK
13. Dermatologikum; Hamburg Germany