1. Department of Medical Physiology, National Research Centre, Cairo, Egypt
2. Department of Surgery, Charles Drew University of Medicine and Science, Los Angeles, CA, USA
3. Faculty of Science, University of Mansoura, Mansoura, Egypt
4. Department of Pathology, National Research Centre, Cairo, Egypt
5. Department of Social and Preventive Medicine, Charles Drew University of Medicine and Science, Los Angeles, CA, USA