1. Department of Oral and Maxillofacial Radiology, Faculty of Oral and Dental Medicine, Egyptian Russian University, Cairo, Egypt.
2. Department of Oral Medicine, Periodontology and Oral Diagnosis, Faculty of Oral and Dental Medicine, Egyptian Russian University, Cairo, Egypt.
3. Department of Orthodontics and Dentofacial Orthopedics, Faculty of Dentistry, Assiut University, Assiut, Egypt.
4. Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Assiut University, Assiut, Egypt.