1. Unit of Oral Medicine, Department of Surgical, Oncological & Oral Sciences, University of Palermo, Palermo, Italy.
2. University College London, UCL Eastman Dental Institute, & NIHR University College London Hospitals Biomedical Research Centre, London, UK
3. Unit of Oncology, Department of Oncology & Hematology, Azienda Ospedaliera di Alessandria (City Hospital), Alessandria, Italy
4. Unit of Oral Medicine, Department of Surgical, Oncological & Oral Sciences, University of Palermo, Palermo, Italy
5. Unit of Oral & Maxillofacial Surgery, Department of Surgery, Azienda Ospedaliera Universitaria Integrata, Verona, Italy