1. Operative Unit of Dentistry University‐Hospital of Ferrara Ferrara Italy
2. Research Centre for the Study of Periodontal and Peri‐implant Diseases University of Ferrara Ferrara Italy
3. Operative Unit of Dentistry and Maxillofacial Surgery, Department Integrated Activity ‐ Specialist Surgeries University‐Hospital of Modena Modena Italy
4. Department of Specialistic Surgeries Head‐Neck University of Modena and Reggio Emilia Modena Italy
5. Department of Periodontics, School of Dentistry West Virginia University Morgantown WV USA
6. Private Practice Torre Pedrera Rimini Italy
7. Center of Clinical Epidemiology University of Ferrara Ferrara Italy