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