1. Institute for Health Services Research in Dermatology and Nursing (IVDP) University Medical Center Hamburg‐Eppendorf (UKE) Hamburg Germany
2. Department of Dermatology and Allergology Biederstein Technical University of Munich Munich Germany
3. Clinic for Dermatology and Allergology University Hospital Marburg (UKGM) Marburg Germany
4. Department of Dermatology and Allergology Friedrich Schiller University Jena Germany
5. Department of Dermatology and Allergology Augsburg University Hospital Augsburg Germany