1. Department of Oral Surgery, Implantology and Periodontics, Faculty of Dentistry, Universidad Alfonso X el Sabio, Madrid, Spain
2. Department of Dental Clinical Specialties, Faculty of Dentistry, Universidad Complutense de Madrid, Madrid, Spain
3. Doctoral Programme in Surgery and Odontostomatology, University of Alcalá de Henares, Alcalá de Henares, Madrid, Spain
4. Department of Surgery, Faculty of Medicine, Dental Clinic, University of Salamanca, Salamanca, Spain