1. Oral Medicine Complex Unit; Head & Neck Clinical Section; Department of Neurosciences, Reproductive and Odontostomatological Sciences; “Federico II” University of Naples; Naples Italy
2. Unit of Oral Pathology, Oral Medicine and Gerodontology; Department of Biomedical, Surgical and Dental Sciences; AO San Paolo Hospital of Milan; University of Milan; Milan Italy
3. Oral Pathology and Medicine; School of Dentistry; Catholic University of Rome; Rome Italy
4. Oral Medicine and Pathology Unit; Department of Medical, Surgical and Health Sciences; University of Trieste; Trieste Italy
5. Unit of Oral Pathology, Medicine and Laser Surgery; Department of Biomedical, Biotechnological and Translational Sciences; University of Parma; Parma Italy
6. Oral Medicine and Oral Oncology Unit; Department of Oncology; University of Turin; Turin Italy
7. Unit of Oral Pathology and Medicine; Department of Biomedical, Surgical and Dental Sciences; University of Milan; Ospedale Maggiore Policlinico IRCCS Ca’ Granda Foundation; Milan Italy
8. Unit of Oral Pathology and Medicine; Department of Biomedical and Neuromotor Sciences; University of Bologna; Bologna Italy
9. Department of Surgical, Oncological, and Oral Sciences; Sector of Oral Medicine “Valerio Margiotta”; University of Palermo; Palermo Italy
10. Oral Medicine Section; Department of Surgical Sciences; CIR Dental School; University of Turin; Turin Italy
11. Department of Clinical and Experimental Medicine; University of Foggia; Foggia Italy
12. Laboratory and Research Group STAD Statistics, Technology; Data Analysis Department of Economics and Statistics; “Federico II University of Naples”; Naples Italy