1. Department of Oral and Maxillofacial Radiology, Faculty of Oral and Dental Medicine, Delta University for Science and Technology, Gamasa, Egypt.
2. Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Cairo University, Cairo, Egypt.
3. Department of Oral and Maxillofacial Radiology, Galala University, Sokhna, Egypt.
4. Department of Oral and Maxillofacial Radiology, Mansoura University, Mansoura, Egypt.