1. Department of Pathology, College of Medicine, King Khalid University, Abha, Kingdom of Saudi Arabia
2. Department of Pathology, University of Khartoum, Khartoum, Sudan
3. Department of Medical Physiology, College of Medicine, King Khalid University, Abha, Kingdom of Saudi Arabia
4. Faculty of Medicine, Department of Medical Physiology, Cairo University, Cairo, Egypt
5. Faculty of Medicine, Department of Physiology, University of Khartoum, Khartoum, Sudan
6. National Liver Institute, Department of Pathology, Menoufyia University, Menoufyia, Egypt
7. Faculty of Medicine, Department of Medical Physiology, Assiut University, Assiut, Egypt