1. Department of Medicine and Surgery, Batterjee Medical College, Jeddah 21442, Saudi Arabia
2. Department of Medicine and Surgery, Vision College, Jeddah 23643, Saudi Arabia
3. Faculty of Medicine, Taibah University, Al-Madinah Almunawwarah 41477, Saudi Arabia
4. Medical Physiology Department, Kasr Alainy, Faculty of Medicine, Cairo University, Giza 11562, Egypt
5. General Medicine Practice Program, Department of Physiology, Batterjee Medical College, Jeddah 21442, Saudi Arabia