1. Maxillofacial Surgery Unit, General Surgery Department, Faculty of Medicine, Assiut University, Asyut, Egypt.
2. King Fahd Specialist Hospital, Burayda, Qassim Province, Saudi Arabia.
3. Maxillofacial Surgery Unit, General Surgery Department, Faculty of Medicine, Sohag University, Akhmim, Sohag Governorate, Egypt.
4. Oral and Maxillofacial Surgeon, Alexandria, Egypt.