Affiliation: | 1. PhD student, Department of Orthodontics, University of Hama Dental School, Hama, Syria;2. Professor of Orthodontics, Department of Orthodontics, University of Damascus Dental School, Damascus, Syria;3. Professor of Toxins and Pharmaceutics, University of Damascus, Faculty of Pharmacology, Damascus, Syria;4. Professor of Orthodontics, Department of Orthodontics, University of Hama Dental School, Hama, Syria |