1. Department of Dermatology Hôpital Erasme Université Libre de Bruxelles Brussels Belgium
2. Melanoma Unit Hospital Clinic Barcelona University of Barcelona Barcelona Spain
3. CIBER de enfermedades raras Instituto de Salud Carlos III Barcelona Spain
4. Dermatology Unit Department of Medical Surgical and Neurological Sciences University of Siena Siena Italy
5. Department of Pathology Hôpital Erasme Université Libre de Bruxelles Brussels Belgium
6. Department of Dermatology University Hospital of Saint‐Etienne Saint‐Etienne France
7. Department of Dermatology Institut Jules Bordet Université Libre de Bruxelles Brussels Belgium