1. Department of Orthodontics, Faculty of Dentistry, University of Damascus, Damascus P.O. Box 30621, Syria
2. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, University of Damascus, Damascus P.O. Box 30621, Syria
3. Department of Periodontics, Faculty of Dentistry, University of Damascus, Damascus P.O. Box 30621, Syria
4. Department of Restorative Dentistry and Endodontics, Faculty of Dentistry, Damascus University, Damascus P.O. Box 30621, Syria
5. Preventive Dental Science Department, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences (KSAU-HS), Riyadh 11426, Saudi Arabia
6. Department of Applied Sciences, Faculty of Economics, Damascus University, Damascus P.O. Box 30621, Syria