1. Department of Dermatology Rouen University Hospital, and INSERM U905 Institute for Research and Innovation in Biomedicine University of Rouen Rouen France
2. Department of Dermatology Bichat University Hospital AP‐HP Paris France
3. Department of Dermatology Medical Center University of Freiburg Freiburg Germany
4. Laboratory of Molecular and Cell Biology Istituto Dermopatico dell'Immacolata IRCCS Via Monti di Creta 104 00167 Roma Italy
5. Policlinico Gemelli – Università Cattolica del ‘Sacro Cuore’ Largo Gemelli 8 00168 Roma Italy
6. University Hospital Center Zagreb Department of Dermatology and Venereology Salata 4 10000 Zagreb Croatia
7. Department of Dermatology Dijon University Hospital Dijon France
8. Department of Dermatology Universitätsklinik für Dermatologie Inselspital CH‐3010 Bern Switzerland
9. Department of Dermatology Avicenne Hospital University Paris 13 Bobigny France
10. Department of Dermatology Saint Etienne University Hospital Saint Etienne France
11. Aix‐Marseille University UMR 911 INSERM CRO2 ‘Centre de Recherche en Oncologie Biologique et Oncophamacologie’ Department of Dermatology Hôpital Timone Assistance Publique des Hôpitaux de Marseille 264 Rue Saint Pierre 13385 Marseille France
12. Department of Dermatology Henri Mondor University Hospital AP‐HP Créteil France
13. Department of Biostatistics INSERM U657 Rouen University Hospital University of Rouen Rouen France
14. Department of Dermatology University of Pennsylvania, and Philadelphia VAMC Philadelphia PA U.S.A
15. Department of Dermatology St George Hospital University of NSW Sydney Australia
16. Department of Dermatology Philipps University Marburg Marburg Germany