1. Department of Pathology Université de Tours, Centre Hospitalier Universitaire de Tours Tours France
2. Department of Biopathology Center Léon Bérard Lyon France
3. Université de Lyon, Université Claude Bernard Lyon 1, INSERM 1052, CNRS 5286, Centre Léon Bérard, Cancer Research Center of Lyon Equipe Labellisée Ligue contre le Cancer Lyon France
4. Platform of Somatic Tumor Molecular Genetics Université de Tours, Centre Hospitalier Universitaire de Tours Tours France
5. “Biologie des infections à polyomavirus” team, UMR INRA ISP 1282 Université de Tours Tours France
6. French Network of Rare Skin Cancers, CARADERM France
7. Department of Pathology Hôpital Haut‐Lévêque, CHU de Bordeaux, Pessac, France, CARADERM network
8. Department of Pathology Hôpital Cochin, AP‐HP, AP‐HP.Centre – Faculté de Médecine, University Paris Cité Paris France
9. Department of Dermatopathology, St John's Institute of Dermatology St Thomas's Hospital London UK
10. Institute of Pathology Medical Faculty University of Ljubljana Ljubljana Slovenia
11. Department of Pathology APHP Hôpital Saint Louis, Université Paris Cité Paris France
12. Department of Pathology Tokyo Metropolitan Cancer and Infectious Disease Center Komagome Hospital Tokyo Japan
13. Department of Diagnostic Pathology Shizuoka Cancer Center Hospital Japan
14. Department of Diagnostic Pathology and Cytology Osaka International Cancer Institute Osaka Japan
15. Department of Dermatology Hyogo Cancer Center Akashi Japan
16. Department of Pathology Jan Yperman Hospital Belgium
17. Department of Pathology, CHU Toulouse Institut Universitaire du Cancer Toulouse Oncopole, Université Toulouse III Paul Sabatier Toulouse France
18. Department of Pathology Centre Hospitalier Universitaire de Lyon Lyon France
19. Department of Pathology APHP Bichat Hospital Paris France
20. Department of Pathology Timone University Hospital Marseille France
21. Dermatology Clinic Hôpitaux Universitaires & Université de Strasbourg, Hôpital Civil Strasbourg France