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. Private practice Rimini Italy
4. Private practice Gorizia Italy
5. Private practice Palermo Italy
6. Department of Biomedical and Neuromotor Sciences University of Bologna Italy
7. Center of Clinical Epidemiology University of Ferrara Italy