1. Institute of Research and Advanced Training in Health Sciences and Technologies (IINFACTS), University Institute of Health Sciences (IUCS), CESPU, CP 4585-116 Paredes, Portugal
2. Medical-Surgical Dentistry Research Group (OMEQUI), Health Research Institute of Santiago de Compostela (IDIS), University of Santiago de Compostela, CP 15782 Santiago, Spain
3. Oral Medicine Department, The Dental Institute, King’s College and the WHO Collaborating Centre for Oral Cancer, London SE5 9RW, UK
4. Morphological Sciences Department, School of Medicine, University Clinical Hospital, University of Santiago de Compostela, CP 15782 Santiago, Spain
5. Instituto Valenciano de Patología, Universidad Católica de Valencia y Área Mixta de Investigación Oncológica (Centro de Investigación Príncipe de Valencia-UCV), CP 46012 Valencia, Spain
6. Pathology Department, School of Medicine-University Clinical Hospital, University of Santiago de Compostela, CP 15706 Santiago, Spain