1. Department of Prosthetic Dental Science, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
2. Department of Periodontics and Community Dentistry, King Saud University, Riyadh, Saudi Arabia.
3. Department of Clinical Dental Sciences, College of Dentistry, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia.
4. Department of General Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, New York, USA.
5. Research Chair for Biological Research in Dental Health, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.