1. Institute for Health Services Research in Dermatology and Nursing (IVDP); University Medical Center Hamburg-Eppendorf (UKE); Hamburg Germany
2. Department of Dermatology; University Hospital Münster; Münster Germany
3. Practice Dres. Büttner/Meewes/Faubel; Neumünster Germany
4. Department of Dermatology; University Medical Center Schleswig-Holstein; Kiel Germany
5. Department of Dermatology and Allergy; Technical University Munich; Munich Germany
6. Center for Evidence-based Healthcare; University Hospital Carl Gustav Carus; Dresden Germany
7. Division of Immunodermatology and Allergy Research; Clinic for Dermatology; Allergology and Venerology; Hannover Medical School; Hannover Germany
8. Department of Dermatology; Bundeswehrkrankenhaus Berlin; Berlin Germany
9. Hautarztpraxis Braunschweig; Braunschweig Germany