1. Section of Anatomic Pathology and Cytopathology, Department of Surgical Sciences, University of Foggia, Viale L Pinto 1, 71100 Foggia, Italy
2. Department of Odontostomatological, Orthodontical and Surgical Sciences, Second University of Naples, Via De Crecchio 1, 80138 Naples, Italy
3. Section of Oral Pathology, University of Foggia, Viale L Pinto 1, 71100 Foggia, Italy
4. Division of Head and Neck Surgery and Oncology, Department of Otolaryngology, University of Michigan Medical School, Ann Arbor, MI 48109, USA