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.