1. Division of Periodontology, Department of Oral Medicine, Infection, and Immunity Harvard School of Dental Medicine Boston Massachusetts USA
2. Center for Clinical Research and Evidence Synthesis in Oral Tissue Regeneration (CRITERION) Boston Massachusetts USA
3. Department of Periodontics and Oral Medicine University of Michigan School of Dentistry Ann Arbor Michigan USA
4. Department of Biomedical, Surgical and Dental Sciences University of Milan Milan Italy
5. IRCCS Foundation Polyclinic Ca’ Granda University of Milan Milan Italy
6. Harvard School of Dental Medicine Boston Massachusetts USA