1. Department of Periodontics & Oral Medicine University of Michigan School of Dentistry Ann Arbor Michigan USA
2. Center for clinical Research and evidence synthesis In oral TissuE RegeneratION (CRITERION) Ann Arbor Michigan USA
3. Department of Life, Health and Environmental Sciences University of L'Aquila L'Aquila Italy
4. Department of Biomedical and Neuromotor Sciences University of Bologna Bologna Italy
5. Private practice, Moscow, Russia and Piacenza Italy
6. Department of Biomedical, Surgical and Dental Sciences, Foundation IRCCS Ca’ Granda Polyclinic University of Milan Milan Italy
7. Department of Oral Medicine, Infection, and Immunity, Division of Periodontology Harvard School of Dental Medicine Boston Massachusetts USA