1. Surgery and Medical-Surgical Specialties Department, Area of Orthodontics, Faculty of Medicine, University of Oviedo, Oviedo, Spain
2. Cruces University Hospital Department of Maxillofacial Surgery, Barakaldo, Spain
3. Stomatology I Department, Faculty of Medicine, University of the Basque Country, Leioa, Spain
4. Sleep and Ventilation Unit, Respiratory Division, Cruces University Hospital, Barakaldo, Spain