1. Department of Community Medicine, Faculty of Medicine, Universiti Sultan Zainal Abidin, Terengganu, Malaysia
2. Dental Public Health Unit, School of Dental Sciences, Universiti Sains Malaysia, Kelantan, Malaysia
3. Consultant, Oral and Maxillofacial surgeon, Prince Mutaib Bin Abdul Aziz Hospital, Ministry of Health, Al-Jouf, Kingdom of Saudi Arabia
4. Division of Clinical Dentistry (Prosthodontics), School of Dentistry, International Medical University, Kualalumpur, Malaysia
5. Department of Biostatistics, School of Dental Sciences, Universiti Sains Malaysia, Kelantan, Malaysia
6. Department of Preventive Dental Science, Orthodontic Division, College of Dentistry, Jouf University, Kingdom of Saudi Arabia