1. Department of Periodontics and Community Dentistry, College of Dentistry, King Saud University, P.O. Box 60169, Riyadh 11545, Saudi Arabia
2. Dental Intern, College of Dentistry, King Saudi University, P.O. Box 60169, Riyadh 11545, Saudi Arabia
3. Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, P.O. Box 60169, Riyadh 11545, Saudi Arabia