1. Hautärzte Rue 143 45130 Essen
2. Klinik und Poliklinik für Dermatologie und Allergologie des Universitätsklinikums Bonn
3. CVderm – Centre of Excellence for Health Services Research in DermatologyInstitute for Health Services Research in Dermatology and Nursing, University Medical Center Hamburg‐Eppendorf Hamburg Germany
4. Dermatologische Spezialpraxis Kirchstr. 1 56242 Selters
5. Psoriasis Center, Department of Dermatology, Venereology and AllergyUniversity Medical Center Schleswig‐Holstein Campus Kiel Germany
6. Private Practice Osnabrück Germany
7. Department of Dermatology, Medical FacultyHeinrich‐Heine‐University Düsseldorf Germany
8. Department of DermatologyVenereology and Allergy of University Hospital Frankfurt Theodor‐Stern‐Kai 7 60590 Frankfurt am Main
9. Psoriasis Center, Department of Dermatology, Venerology and AllergyUniversity Hospital Erlangen Ulmenweg 18 91054 Erlangen