1. Implant Center for Edentulism and Jawbone Atrophies, Maxillo-Facial Surgery and Odontostomatology Unit, Fondazione Instituto di Ricovero e Cura a Carattere Scientifico, Cà Granda Ospedale Maggiore Policlinico, University of Milan, Milan, Italy.
2. Department of Human Pathology, School of Dentistry, University of Messina, Messina, Italy.