1. Department of Surgery and Medical-Surgical Specialities, School of Medicine and Health Sciences, University of Oviedo, 33003 Oviedo, Spain
2. Department of Surgical Sciences, School of Periodontology and Implantology, Mississippi Institution, 28010 Madrid, Spain
3. Department of Surgical Sciences, Division of Conservative Dentistry and Endodontics, University of Cagliari, 09124 Cagliari, Italy
4. Department of Surgical Sciences, Postgraduate School in Orthodontics, University of Cagliari, 09124 Cagliari, Italy