1. Medicine and Oral Surgery Department; Institute of Research and Advanced Training in Health Sciences and Technologies (IINFACTS); University Institute of Health Sciences (IUCS), CESPU; Paredes Portugal
2. Medical-Surgical Dentistry Research Group (OMEQUI); Health Research Institute of Santiago de Compostela (IDIS); University of Santiago de Compostela; Santiago de Compostela Spain
3. Oral Medicine Department; The Dental Institute; King's College London; London UK
4. the WHO Collaborating Centre for Oral Cancer; London UK
5. Morphological Sciences Department; School of Medicine-University Clinical Hospital; University of Santiago de Compostela; Santiago de Compostela Spain
6. Instituto Valenciano de Patología; Universidad Católica de Valencia y Área mixta de investigación Oncológica (Centro de Investigación Príncipe de Valencia- UCV); Valencia Spain
7. Pathology; School of Medicine - University Clinical Hospital; University of Santiago de Compostela; Santiago de Compostela Spain