1. Institute for Health Services Research in Dermatology and Nursing (IVDP) University Medical Center Hamburg‐Eppendorf (UKE) Hamburg Germany
2. Dermatologische Spezialpraxis Selters Germany
3. Gemeinschaftspraxis für Dermatologie und Allergologie Mönchengladbach Germany
4. Center for Inflammatory Skin Diseases Department of Dermatology University Medical Center Schleswig‐Holstein Kiel Germany