1. Department of Dermatology and Allergology University Medical Center Göttingen Göttingen Germany
2. Information Network of Departments of Dermatology (IVDK) University of Göttingen Göttingen Germany
3. Department of Dermatology and Allergology Allergy‐Center‐Charité, Charité – Universitätsmedizin Berlin Berlin Germany
4. Department of Dermatology University Hospital Carl Gustav Carus Technical University Dresden Dresden Germany
5. Department of Dermatology and Allergy Ludwig Maximilian University Munich Germany
6. Division of Dermatology Queen's University 166 Brock Street C3‐027 Kingston ON K7L 5G2 Canada