1. Department of Physiology, College of Medicine, King Khalid University, Abha, Saudi Arabia
2. Department of Basic Medical Sciences, College of Medicine, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia
3. Department of Physiology, Kasr Al-Aini Faculty of Medicine, Cairo University, Cairo, Egypt
4. Department of Medical Histology, Kasr Al-Aini Faculty of Medicine, Cairo University, Cairo, Egypt
5. Department of Pathology, College of Medicine, King Khalid University, Abha, Saudi Arabia