1. Department of Physiology, College of Medicine, King Khalid University, Abha, Saudi Arabia
2. Department of Clinical Biochemistry, College of Medicine, King Khalid University, Abha, Saudi Arabia
3. Department of Medical Biochemistry, Faculty of Medicine, Mansoura University, Mansoura, Egypt
4. Department of Physiology, Kasr Al-Aini Faculty of Medicine, Cairo University, Cairo, Egypt
5. Department of Medical Histology, Kasr Al-Aini Faculty of Medicine, Cairo University, Cairo, Egypt