1. Department of Maxillo-Facial Surgery, Hospital of Perugia, Sant’Andrea Delle Fratte, 06132 Perugia, Italy
2. Department of Medicine, Section of Maxillofacial Surgery, University of Siena, Viale Bracci, 53100 Siena, Italy
3. Unit of Paediatric Dentistry, Department of Surgical and Biomedical Sciences, University of Perugia, 06132 Perugia, Italy
4. Department of Medicine and Surgery, Faculty of Dentistry, University of Perugia, Sant Andrea delle Fratte, 06156 Perugia, Italy
5. Department of Surgical and Biomedical Sciences, Section of Maxillo-Facial Surgery, University of Perugia, Piazzale Gambuli 1, 06129 Perugia, Italy