1. Department of Oral Surgery, Oral Medicine, Pathology and Periodontics; The University of Jordan; Amman Jordan
2. WHO Collaborating Centre for Oral Health-General Health, Oral Medicine; Bristol Dental Hospital and School; Bristol UK
3. Department of Oral Pathology; University of Lima; Lima Peru
4. Department of Oral Pathology; University of Campinas; Piracicaba São Paulo Brazil