1. Department of Oral and Maxillofacial Radiology, Faculty of Oral and Dental Medicine, Egyptian Russian University, Cairo, Egypt.
2. Department of Oral and Maxillofacial Surgery, Faculty of Oral and Dental Medicine, South Valley University, Qena, Egypt.
3. Department of Orthodontics and Dentofacial Orthopedics, Faculty of Dentistry, Assiut University, Assiut, Egypt.
4. Department of Periodontology and Oral Medicine, Faculty of Oral and Dental Medicine, South Valley University, Qena, Egypt.
5. Department of Operative Dentistry, Sinai University, Kantara, Egypt.
6. Department of Oral and Maxillofacial Surgery, Ministry of Interior Hospitals, Cairo, Egypt.
7. Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Assiut University, Assiut, Egypt.