1. Department of Neurology RWTH Aachen University Aachen Germany
2. Faculty of Medicine Cairo University Cairo Egypt
3. Department of Human Anatomy and Embryology, Faculty of Medicine Port Said University Port Said Egypt
4. Faculty of Medicine Helwan University Cairo Egypt
5. Faculty of Medicine Mansoura University Mansoura Egypt
6. Department of Physical Medicine & Rehabilitation, Faculty of Medicine Ain Shams University Cairo Egypt