1. Department of Preventive Medicine; Public Health and History of the Science; Faculty of Medicine; University Complutense of Madrid; Madrid Spain
2. Department of Bucofacial Medicine and Surgery; Faculty of Odontology; University Complutense of Madrid; Madrid Spain
3. Department of Prevention, Odontopediatrics and Orthodontics; Faculty of Odontology; University Complutense of Madrid; Madrid Spain
4. Oral Medicine; King's College London; WHO Collaborating Centre for Oral Cancer; London UK