1. Department of Health Sciences. Universidad Autónoma Metropolitana-Xochimilco, México City, Mexico
2. Epidemiology Unit, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand
3. Department of Oral Pathology, School of Dentistry, University of Sao Paulo, Brazil
4. Division of Oral and Maxillofacial Surgery, Oral Medicine and Oral Pathology, Dublin Dental School and Hospital, Trinity College, Dublin, Ireland
5. Academic Department of HIV Medicine, Harrison Wing, Medical Schools of King’s College London, London, UK
6. Queen Mary University of London, Barts, and the London School of Medicine and Dentistry, London, UK