1. Department of Anatomy, Cell Biology and Physiological Sciences, Faculty of Medicine , American University of Beirut , Beirut , Lebanon
2. Department of Natural Sciences, School of Arts and Sciences , Lebanese American University , Beirut , Lebanon
3. Department of Biochemistry and Molecular Genetics, Faculty of Medicine , American University of Beirut , Beirut , Lebanon
4. Department of Neurology, Faculty of Medicine , American University of Beirut , Beirut , Lebanon