1. Department of DermatologyVenereology and AllergyUniversity Medical Centre MannheimMedical Faculty MannheimHeidelberg University and Centre of Excellence of Dermatology of Baden‐Württemberg Mannheim Germany
2. European Center of AngioscienceMedical Faculty MannheimHeidelberg University Heidelberg Germany
3. HautklinikStädtisches Klinikum KarlsruheAkademisches Lehrkrankenhaus der Universität Freiburg Karlsruhe Germany
4. Department of Medical StatisticsRuprecht‐Karls‐University of Heidelberg Mannheim Germany
5. Department of DermatologyHospital of Krefeld Krefeld Germany
6. Department of DermatologyVenereology and AllergyJulius‐Maximilians‐University Würzburg Germany
7. Department of DermatologyUniversity of Cologne Cologne Germany
8. Department of Dermatology and Skin Tumor CenterUniversity Hospital Essen‐Duisburg Essen‐Duisburg Germany
9. Department of DermatologyVenereology and AllergyUniversity Hospital Bochum Bochum Germany
10. Department of Dermatology and VenereologyUniversity Hospital and Martin‐Luther‐University of Halle‐WittenbergHalle (Saale) Germany
11. Department of DermatologyHospital of Dortmund Dortmund Germany
12. Skin Cancer Center CharitéDepartment of Dermatology and AllergyCharité –Universitätsmedizin Berlin Berlin Germany
13. Department of DermatologyHospital of Ludwigshafen Ludwigshafen Germany
14. Department of DermatologyVenereology and AllergySaarland University Hospital Homburg/Saar Germany
15. Department of DermatologyAllergy and PhlebologyHospital of Bremerhaven Bremerhaven Germany
16. Department of DermatologyHospital of Bremen Bremen Germany
17. Department of Dermatology and VenereologyMedical Center – University of FreiburgFaculty of Medicine University of Freiburg Germany
18. Department of PathologyRuprecht‐Karls‐University of Heidelberg Mannheim Germany
19. Institute of PathologyJulius‐Maximilians‐University Würzburg Germany
20. Kempf and PfaltzHistologische Diagnostik Zurich Switzerland
21. Department of Dermatology University Hospital Zurich Zurich Switzerland