1. Oral Medicine Unit, School of Dental Sciences, Universiti Sains Malaysia, Kota Bharu, Malaysia
2. Department of Dental Public Health, School of Dental Sciences, Universiti Sains Malaysia, Kota Bharu, Malaysia
3. Department of Oral and Maxillofacial Surgery, School of Dental Sciences, Universiti Sains Malaysia, Kota Bharu, Malaysia
4. Preventive Dental Sciences Department, Community Dentistry Division, College of Dentistry, Princess Nourahbint Abdulrahman University, Riyadh, Saudi Arabia
5. Department of Restorative Dental Science, Division of Endodontics, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
6. Department of Periodontics and Community Dentistry, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
7. Department of Prosthetic Dental Science, College of Dentistry, King Saud University; Research Chair for Biological Research in Dental Health, College of Dentistry, Riyadh, Saudi Arabia