1 Department of Periodontics and Community Dentistry, Dental College, King Saud University, PO Box 60169, Riyadh, 11545, Saudi Arabia. raljasser@ksu.edu.sa.
2 Department of Preventive Dental Sciences, College of Dentistry, Prince Sattam Bin Abdulaziz University, Al Kharj, Kingdom of Saudi Arabia.
3 Department of Periodontics and Community Dentistry, Dental College, King Saud University, PO Box 60169, Riyadh, 11545, Saudi Arabia.