1. Department of Dermatology Erasmus Medical Centre Rotterdam The Netherlands
2. Department of Dermatology, Allergy and Phlebology Hospital of Bremerhaven Bremerhaven Germany
3. Department of Dermatology and Venerology University Hospital Hamburg‐Eppendorf (UKE) Hamburg Germany
4. Department of Dermatology Medical University of Vienna Vienna Austria
5. Department of Dermatology Leiden University Medical Centre Leiden The Netherlands