[1] University of Messina,Department of Biomedical, Odontostomatological Sciences and of Morphological and Functional Images, Unit of Periodontology, School of Dentistry
[2] University of Naples “Federico II”,Department of Neurosciences, Reproductive and Odontostomatological Sciences, School of Medicine
[3] UNC School of Dentistry,Department of Periodontology
[4] University of Catanzaro,Department of Periodontology
[5] University of Messina,Department of Economics, Unit of Statistics and Mathematical Sciences