Institution: | 1. Department of Anaesthesia, Cairo University, , Cairo, Egypt;2. Department of Anaesthesia, Liver Institute, Menoufiya University, , Shebeen El Kom, Egypt;3. Department of Community Medicine and Statistics, Liver Institute, Menoufiya University, , Shebeen El Kom, Egypt;4. Department of Surgery, Liver Institute, Menoufiya University, , Shebeen El Kom, Egypt |