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. Center for Clinical Research and Evidence Synthesis in Oral Tissue Regeneration (CRITERION) Boston Massachusetts USA
4. Department of Medical Biotechnologies, Unit of Periodontology Endodontology and Restorative Dentistry, University of Siena Siena Italy
5. Division of Maxillofacial Surgery University of Torino Torino Italy
6. Department of Periodontics and Oral Medicine University of Michigan Michigan USA
7. Private Practice Torino Italy