1. Institute of Dentistry, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK
2. Faculty of Dental Sciences, University of Peradeniya, Peradeniya, Sri Lanka
3. National Institute of Health Sciences, Southern Province, Sri Lanka
4. District General Hospital, Embilipitiya, Sri Lanka
5. Faculty of Medical Sciences, University of Sri Jayewardenepura, Gangodawila, Nugegoda, Sri Lanka