1. Department of Dermatology and Allergy Ludwig Maximilian University of Munich Munich Germany
2. Department of Dermatology and Allergy University Hospital Schleswig‐Holstein Campus Kiel Kiel Germany
3. Division of Allergy and Immunology Department of Dermatology Venereology and Allergy Charité–Universitätsmedizin Berlin Berlin Germany
4. Department of Dermatology and Allergy University Hospital of Bonn Bonn Germany