1. Institute for Health Services Research in Dermatology and Nursing (IVDP); University Medical Center Hamburg-Eppendorf (UKE); Hamburg Germany
2. Dematologikum Berlin; Berlin Germany
3. Clinic for Dermatology; Essen University Hospital; Essen Germany
4. Dermatological Practice Maxdorf; Maxdorf Germany
5. Department for Dermatology, Venerology and Allergology; University Medical Center Schleswig-Holstein; Kiel Germany
6. Comprehensive Center for Inflammation Medicine; University Medical Center Schleswig-Holstein; Lübeck Germany
7. Dermatological Practice Selters; Selters Germany