1. Department of Conservative Dentistry and Endodontics, University of Cagliari Cittadella Universitaria di Monserrato Monserrato Cagliari Italy
2. Department of Surgical Sciences, University of Cagliari Cittadella Universitaria di Monserrato Monserrato Cagliari Italy
3. Department of Economics and Business Sciences University of Cagliari Cagliari Italy
4. Department of Medical Sciences and Public Health, University of Cagliari Cittadella Universitaria di Monserrato Monserrato Cagliari Italy
5. Division of Restorative Dentistry and Periodontology, Dublin Dental University Hospital Trinity College Dublin Dublin Ireland