1. Department of Oral Medicine Institut Claudius Regaud, Institut Universitaire du Cancer Toulouse‐Oncopole Toulouse France
2. Department of Dermatology Centre Hospitalo‐Universitaire de Toulouse, Hopital Larrey France Toulouse France
3. Department of Oncodermatology Institut Claudius Regaud, Institut Universitaire du cancer Toulouse‐Oncopole Toulouse France
4. Department of Pathology Institut Claudius Regaud, Institut Universitaire du Cancer Toulouse‐Oncopole Toulouse France
5. The WHO Collaborating Centre, Oral Cancer and Faculty of Dentistry, Oral and Craniofacial Sciences King's College London London UK
6. Faculté de Chirurgie Dentaire Université Paul Sabatier, Centre Hospitalier Universitaire Toulouse France