1. Department of Periodontology, College of Dentistry; Princess Nourah Bint Abdulrahman University; Riyadh Saudi Arabia
2. Department of General Dentistry, Eastman Institute for Oral Health; University of Rochester; Rochester New York USA
3. Departments of Community Dentistry and Oral Disease Prevention and Orthodontics and Dentofacial Orthopedics, Eastman Institute for Oral Health; University of Rochester; Rochester New York USA