1. Research Centre for the Study of Periodontal and Peri‐Implant Diseases University of Ferrara Ferrara Italy
2. Operative Unit of Dentistry AUSL of Ferrara Ferrara Italy
3. Department of Periodontology, Institute of Odontology, Sahlgrenska Academy University of Gothenburg Göteborg Sweden
4. Section of Periodontology, Faculty of Odontology University Complutense of Madrid Madrid Spain
5. Private Practice in Napoli Napoli Italy
6. Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana" University of Salerno Baronissi Italy
7. Private Practice in Bologna Bologna Italy