1. Department of Restorative Dental Sciences, UCL-Eastman Dental Institute, Medical Faculty, University College London, London WC1E 6DE, UK
2. Department of Surgical Sciences and Integrated Diagnostics, University of Genoa, 16132 Genoa, Italy
3. Department of Periodontology, Swargiya Dadasaheb Kalmegh Smruti Dental College and Hospital, Nagpur 440001, India
4. Department of Oral Biology ad Biomedical Engineering, University of Buffalo, Buffalo, NY 14215, USA
5. Centre de Haute Energie (CHE), 10, Bd Pasteur, 06000 Nice, France