1. Primary Care; EOXI Lugo; Cervo; e Monforte; Galician Health Service; Lugo Spain
2. Stomatology Department; University of Santiago de Compostela; Santiago de Compostela (A Coruña) Spain
3. Service of Oral and Maxillofacial Surgery; A Coruña University Hospital; Galician Health Service; A Coruña Spain
4. Service of Oral and Maxillofacial Surgery; POVISA Hospital; Vigo (Pontevedra) Spain
5. Department of Medical-Surgical Specialities; University of Oviedo; Oviedo Spain
6. Department of Preventive Medicine; University of Santiago de Compostela; Santiago de Compostela (A Coruña) Spain