1. Department of Medical Biotechnologies, Division of Fixed Prosthodontics, University of Siena, Siena, Italy
2. Department of Restorative Dentistry, University of Leeds, Leeds, UK
3. Department of Neurosciences, Reproductive and Odontostomatological Sciences, University Federico II, Naples, Italy
4. Clinic for Paediatric and Preventive Dentistry, Faculty of Dental Medicine, University of Belgrade, Serbia
5. Department of Medical Biotechnologies, Division of Restorative Dentistry and Endodontics, University of Siena, Siena, Italy
6. Department of Medical Biotechnologies, Division of Periodontics, University of Siena, Siena, Italy
7. Department of Medical Biotechnologies, Division of Periodontics, Complutense University, Madrid, Spain