Affiliation: | 1. National Cancer Control Programme, , Colombo 05, Sri Lanka;2. Family Health Bureau, , Colombo 05, Sri Lanka;3. Oral Health Institute, , Maharagama, Sri Lanka;4. Griffith Health Institute, Population and Social Health Research Programme, Gold Coast Campus, Griffith University, , Gold Coast, Qld, Australia;5. Oral Medicine, King's College, , London, UK;6. WHO Collaborating Centre for Oral Cancer, , London, UK |