1. Department of Anatomy, Cell Biology, and Physiological Sciences, American University of Beirut, Beirut, Lebanon.
2. Department of Physiology, Faculty of Medicine, Jordan University of Science and Technology, Irbid, Jordan.
3. Faculty of Medicine, King Fahad Medical City, King Saud Bin Abdulaziz University for Health Sciences, Riyadh 11525, Kingdom of Saudi Arabia.