1. Department of Biomedical Sciences and Public Health; Section of Pathologic Anatomy and Histopathology; Polytechnic University of Marche; Ancona Italy
2. Department of Clinical Special and Dental Science, Periodontology; Polytechnic University of Marche; Ancona Italy
3. Centre of Epidemiology; Biostatistic and Medical Statistics; Polytechnic University of Marche; Ancona Italy
4. SOD of Odontostomatological and Special Surgery; United Hospital of Ancona; Ancona Italy