1. Division of Periodontology and Implantology, Department of Biomedical and Neuromotor Sciences, School of Dentistry, Alma Mater Studiorum - University of Bologna, Bologna, Italy.
2. Department of Biomedical and Neuromotor Sciences, School of Dentistry, Alma Mater Studiorum - University of Bologna, Bologna, Italy.
3. Dentistry Service for Patients with Special Needs, Department of Biomedical and Neuromotor Sciences, School of Dentistry, Alma Mater Studiorum - University of Bologna, Bologna, Italy.