1 1 Department of Dental Implants, U. O. C. Maxillofacial Surgery & Odontostomatology, Fondazione IRCCS Cà Granda, University of Milan, Milan, Italy.
2 2 Private practice, Milan, Italy.
3 3 Human Pathology Department, University of Messina, Messina, Italy.
4 4 Oral Surgery and Department of Dental Implants, U. O. C. Maxillofacial Surgery & Odontostomatology, Fondazione IRCCS Cà Granda. University of Milan, Milan, Italy.