1. Dermatology Unit and Skin Bank, Department of Medical, Surgical and Neurosciences Siena University Hospital Siena Italy
2. Department of Dermatology, Hôpital Erasme Université Libre de Bruxelles Brussels Belgium
3. Institut Jules Bordet Université Libre de Bruxelles Brussels Belgium
4. Section of Pathology, Department of Medical Biotechnology University of Siena Siena Italy
5. Department of Pathology University Hospital of Saint‐Etienne Saint Etienne France
6. Dermatology Unit University Hospital of St‐Etienne Saint Etienne France
7. Dermatology department AP‐HM, Aix‐Marseille University Marseille France
8. Melanoma Unit, Department of Dermatology University of Barcelona Barcelona Spain