Pedro Diz Dios is Professor and Head of Special Needs Dentistry at the School of Medicine and Dentistry, Santiago de Compostela University, Spain. He is also Honorary Visiting Professor at the Eastman Dental Institute, University College London, UK. Crispian Scully CBE is a Director of the WHO Collaborating Centre for Oral Health-General Health and Emeritus Professor at the Eastman Dental Institute, University College London, UK.  Oslei Paes de Almeida is Professor of Oral Pathology and Medicine at the Department of Oral Diagnosis, Dental School of Piracicaba, University of Campinas, São Paulo, Brazil. He is also Visiting Professor at both the University of Bristol and University College London, UK. José V. Bagán is Professor of Oral Medicine at Valencia University and Head of Stomatology and Maxillofacial Surgery Service at University General Hospital, Valencia, Spain.  Adalberto Mosqueda Taylor is Professor of Oral Pathology and Medicine at the Health Care Department, Universidad Autónoma Metropolitana Xochimilco and Professor of Oral Medicine at the Hospital General Dr. Manuel Gea González in Mexico City, Mexico.