1. Division of Oral Bio-sciences, Faculty of Dentistry, University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Hong Kong, Department of Oral Medicine, Faculty of Dental Sciences, University of Peradeniya, Peradeniya, Sri Lanka
2. Division of Oral Bio-sciences, Faculty of Dentistry, University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Hong Kong,