1. Department of Maxillofacial Surgery, Azienda Ospedaliera Universitaria “Ospedali Riuniti di Ancona” Umberto I, 60126 Ancona, Italy
2. Department of Maxillofacial Surgery, Hospital of Perugia, Sant’Andrea delle Fratte, 06129 Perugia, Italy
3. Department of Maxillofacial Surgery, University of Siena, 53100 Siena, Italy