1. Department of Internal Medicine, King Fahad Hospital of the University, Imam Abdulrahman Bin Faisal University, Dammam 34212, Saudi Arabia
2. Medical Intern, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam 34224, Saudi Arabia
3. Department of Physiology, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam 34224, Saudi Arabia