1. Department of Oral and Maxillofacial Clinical Sciences, Faculty of Dentistry University of Malaya Kuala Lumpur Malaysia
2. Oral Cancer Research and Coordinating Centre, Faculty of Dentistry University of Malaya Kuala Lumpur Malaysia
3. Department of Oral Pathology, Faculty of Dental Sciences University of Peradeniya Sri Lanka
4. Biostatistics Centre, Division of Health Sciences University of Otago Dunedin New Zealand
5. Oral and Maxillofacial Surgery, Department of Oral Diagnostic and Surgical Sciences, Faculty of Dentistry University of Otago Dunedin New Zealand