1. Research Centre for the Study of Periodontal and Peri‐Implant Diseases University of Ferrara Ferrara Italy
2. Operative Unit of Dentistry Azienda Unità Sanitaria Locale (A.U.S.L.) of Ferrara Ferrara Italy
3. Center of Clinical Epidemiology University of Ferrara Ferrara Italy
4. Biomedical and Neuromotor Sciences Department University of Bologna Bologna Italy