1. The Department of Pedodontics, Orthodontics and Preventive Dentistry College of Dentistry, Hawler Medical University Erbil Iraq
2. Orthodontic Department Azadi Dental Center, General Directorate of Hawler, Ministry of Health Erbil Iraq
3. Orthodontic Department Privet Specialized Dental Clinic Erbil Iraq
4. The Department of Oral Diagnosis College of Dentistry, Hawler Medical University Erbil Iraq
5. P.O.P Department College of Dentistry, Hawler Medical University Erbil Iraq