1. Department of Biomedical and Dental Sciences, Morphological and Functional Images, University Hospital of Messina, Via Consolare Valeria, No. 1, 98125 Messina, Italy
2. Department of Human Pathology, University of Messina, Messina, Italy
3. Department of Oral and Maxillo-Facial Sciences, Pediatric Dentistry Unit, “Sapienza” University of Rome, Rome, Italy