1. Oral and Maxillofacial Surgery Department, Hospital General Universitario Gregorio Marañón, 28007 Madrid, Spain
2. Private Practice, Sta. Susana, 41, 33007 Oviedo, Spain
3. Pathology Department, Hospital General Universitario Gregorio Marañón, 28007 Madrid, Spain
4. Radiology Department, Hospital General Universitario Gregorio Marañón, 28007 Madrid, Spain
5. Public Health and Maternal & Child Health Department, School of Medicine, Universidad Complutense, 28040 Madrid, Spain
6. Oral and Maxillofacial Surgery Department, Hospital Universitario La Paz, 28046 Madrid, Spain
7. Oral and Maxillofacial Surgery Department, Hospital Universitario Ruber Juan Bravo, 28006 Madrid, Spain
8. Radiology Department, Hospital Universitario Puerta de Hierro, 28222 Madrid, Spain