1. Department of Integrated Adult Dentistry, School of Dentistry, University of Oviedo, C/. Catedrático Serrano s/n., 33006 Oviedo, Spain
2. Department of Gastroenterology, Hospital Universitario Central de Asturias, 33004 Oviedo, Spain
3. Head Department of Oral and Maxillofacial Surgery and Oral Medicine, School of Dentistry, University of Oviedo, C/. Catedrático Serrano s/n., 33006 Oviedo, Spain
4. Department of Radiology, Hospital Universitario de San Agustin, 33402 Aviles, Spain