1. Department of Physiology, King Faisal University, College of Medicine and Medical Sciences, P.O. Box 2114, Dammam 31451, Saudi Arabia
2. Department of Pharmacology, King Faisal University, College of Medicine and Medical Sciences, P.O. Box 2114, Dammam 31451, Saudi Arabia
3. Department of Internal Medicine, King Faisal University, College of Medicine and Medical Sciences, P.O. Box 2114, Dammam 31451, Saudi Arabia
4. Department of Surgery, King Faisal University, College of Medicine and Medical Sciences, P.O. Box 2114, Dammam 31451, Saudi Arabia