1. Department of Medical-Surgical Sciences of Communication and Behaviour, School of Dentistry, University of Ferrara, Ferrara, Italy
2. Department of Dentistry, Vita Salute University, San Raffaele Hospital, Milan, Italy
3. Department of Dentistry, University of Messina, Messina, Italy
4. Department of Surgery, Maxillo Facial Surgery, Policlinico Gb Rossi, University of Verona, Verona, Italy