1. Division of Oral Biology, Department of Oral Medicine and Diagnostic Sciences, College of Dentistry, King Saud University
2. Division of Endodontic Dentistry, Department of Restorative Dental Sciences, College of Dentistry, King Saud University
3. Division of Community Dentistry, Department of Periodontics and Community Dentistry, College of Dentistry, King Saud University
4. College of Dentistry, King Saud University