Corresponding Author

Nor Azlida Mohd Nor BDS, MSc, DDPHRCS, PhD

Department of Community Oral Health and Clinical Prevention, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia

Correspondence

Nor Azlida Mohd Nor, Department of Community Oral Health and Clinical Prevention, Faculty of Dentistry, University of Malaya, 50603, Kuala Lumpur, Malaysia. Tel.: +60379674805; Fax: +60379674532; e-mail: azlida@um.edu.my. Nor Azlida Mohd Nor is with Department of Community Oral Health and Clinical Prevention, Faculty of Dentistry, University of Malaya. Barbara L. Chadwick, Damian J. J. Farnell, and Ivor G. Chestnutt are with Department of Applied Clinical Research and Dental Public Health, Cardiff University, School of Dentistry.