1. Department of Pathology College of Medicine King Khalid University Abha Kingdom of Saudi Arabia
2. Department of Pathology Faculty of Medicine 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