1. Anesthesia and intensive care department, Faculty of Medicine, Assiut University, Assiut, Egypt
2. Diagnostic Radiology department, Faculty of Medicine, Assiut University, Assiut, Egypt
3. Department of Neurology, Medical Faculty, Assiut University Hospital, Assiut, Egypt
4. Faculty of Medicine, Assiut University, Assiut, Egypt
5. Anesthesia and intensive care department, Faculty of medicine, Minia university, Minia, Egypt