1. Department of General Surgery and Surgical-Medical Specialties, School of Dentistry, University of Catania, Catania, Italy
2. Department of Clinical Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy
3. Institute of Dentistry and Maxillofacial Surgery, Fondazione Policlinico Universitario Agostino Gemelli, Catholic University of the Sacred Heart, Rome, Italy
4. Department of Life, Health and Environmental Sciences, University of L’Aquila, L’Aquila, Italy