Affiliation: | 1. Division of Orthodontics and Dentofacial Orthopedics, American University of Beirut Medical Center, Beirut, Lebanon;2. Department of Orthodontics, American University of Beirut, Beirut, Lebanon; Department of Orthodontics, Faculty of Dental Medicine, Lebanese University, Beirut, Lebanon;3. Department of Orthodontics, University of Pennsylvania, Philadelphia, Pennsylvania |