1. Department of Physiology, College of Medicine, King Khalid University, Abha, Saudi Arabia;
2. Institute of Cardiovascular Sciences, College of Medicine and Dental Sciences, University of Birmingham, Birmingham, UK;
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 Physiology, College of Medicine, Menoufia University, Shibin el Kom, Egypt