1. Department of Prosthodontics and Dental Materials, School of Dental Medicine, University of Siena
2. Clinic for Paediatric Dentistry, School of Dental Medicine, University of Belgrade
3. Department of Neurosciences, Reproductive and Odontostomatological Sciences, University Federico II of Naples
4. Department of Restorative Dentistry and Endodontics, School of Dental Medicine, University of Siena
5. Department of Restorative Dentistry, University of Leeds