1. 2nd Dermatology Department National and Kapodistrian University of Athens Athens Greece
2. University Hospital Birmingham Birmingham UK
3. Dermatology Department University 12 of Octubre Madrid Spain
4. Department of Dermatology University of Turin Turin Italy
5. University of Leiden Leiden Netherlands
6. Department of Dermatology Medical University of Vienna Vienna Austria
7. Department of Dermatology, Venerology, Allergology und Phlebology Johannes Wesling Klinikum Minden Minden Germany
8. University of Paris Hospital Saint‐Louis Paris France