1. Research Centre for the Study of Periodontal and Peri-implant Diseases; University of Ferrara; Ferrara Italy
2. Operative Unit of Dentistry; University-Hospital of Ferrara; Ferrara Italy
3. Department of Periodontology and Implantology; Alma Mater Studiorum, University of Bologna; Bologna Italy
4. Department of Medical, Surgical and Health Sciences; University of Trieste; Trieste Italy
5. Department of Surgery and Translational Medicine; University of Firenze; Firenze Italy