1. Institute for Health Services Research in Dermatology and Nursing (IVDP) University Medical Center Hamburg‐Eppendorf (UKE) Hamburg Germany
2. Department of Dermatology and Allergy University Hospital Bonn Bonn Germany
3. Department Dermatology and Allergy Hannover Medical School Hannover Germany
4. Department Dermatology and Allergy Ludwig‐Maximilian University Munich Germany