1. Institute for Health Services Research in Dermatology and Nursing (IVDP) University Medical Center Hamburg‐Eppendorf (UKE) Hamburg Germany
2. Dermatology practice Essen Germany
3. Department of Dermatology University of Bonn Bonn Germany
4. Dermatology practice Pinneberg Germany
5. Department of Dermatology University Medical Center Mainz Mainz Germany
6. Department of Dermatology University of Zürich Zürich Switzerland