1. German Center for Health Services Research in Dermatology (CVderm), Institute for Health Services Research in Dermatology and Nursing (IVDP) University Medical Center Hamburg‐Eppendorf (UKE) Hamburg Germany
2. SRH University of Applied Health Science Gera Germany
3. Psoriasis‐Center, Department of Dermatology University Medical Center Schleswig‐Holstein Kiel Germany