1. Department of Orthodontics, Faculty of Oral and Dental Medicine, South Valley University, Qena, Egypt
2. Department of Orthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
3. Department of Dentistry, School of Medicine, European University Cyprus, Nicosia, Cyprus
4. Hamdan Bin Mohammed College of Dental Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates