1. Teaching Hospital Karapitiya, Galle 80000, Sri Lanka
2. Department of Oral Pathology, Faculty of Dental Sciences, University of Peradeniya, Peradeniya 20400, Sri Lanka
3. Institution of Engineers, Wijerama Mawatha, Colombo 00700, Sri Lanka
4. Department of Oral Medicine and Periodontology, Faculty of Dental Sciences, University of Peradeniya, Peradeniya 20400, Sri Lanka
5. Unit of Oral Medicine and Oral Maxillofacial Pathology, Division of Oral and Maxillofacial Surgery, Department of Surgery, University of Geneva & University Hospitals of Geneva, 1205 Geneva, Switzerland