1. Department of Periodontology School of Dental Medicine, University of Bern Bern Switzerland
2. Department of Oral and Maxillofacial Surgery Copenhagen University Hospital (Rigshospitalet) Copenhagen Denmark
3. Department of Restorative, Pediatric and Preventive Dentistry School of Dental Medicine, University of Bern Bern Switzerland
4. Department of Surgical, Medical and Molecular Pathology and Critical Care Medicine University of Pisa Pisa Italy
5. Sub‐Unit of Periodontology, Halitosis and Periodontal Medicine University Hospital of Pisa Pisa Italy
6. Unit of Periodontology, Endodontology and Restorative Dentistry, Department of Medical Biotechnologies University of Siena Siena Italy
7. Division of Maxillofacial Surgery University of Torino Torino Italy
8. Department of Periodontics and Oral Medicine University of Michigan Ann Arbor Michigan USA
9. Private Practice Torino Italy