1 Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy. domenico.azzolino@unimi.it.
2 Department of Head and Neck, Oral Surgery and Implantology Unit, Institute of Clinical Dentistry, Catholic University of Sacred Hearth, Fondazione Policlinico Universitario Gemelli, Rome, Italy.
3 Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy.
4 Geriatric Unit, IRCCS Istituti Clinici Scientifici Maugeri, Milan, Italy.