Dr. Rashad I. Shaadouh, University of Damascus, Faculty of Dentistry, Department of Orthodontics, Damascus, Syria Prof. Mohammad Y. Hajeer, University of Damascus, Faculty of Dentistry, Department of Orthodontics, Damascus, Syria Prof. Mohammed Adel Awawdeh, King Saud bin Abdulaziz University for Health Sciences (KSAU-HS), Preventive Dental Science Department, College of Dentistry, Riyadh 11426, Saudi Arabia Prof. Ghiath A. Mahmoud, University of Damascus, Faculty of Dentistry, Department of Orthodontics, Damascus, Syria Mr. Imad-Addin Almasri, University of Damascus, Faculty of Economics, Department of Applied Statistics, Damascus, Syria