1. Head, Division of Neurology, Department of Medicine, King Faisal Specialist Hospital and Research Center; and Neuropathologist, Department of Pathology, The Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, Ohio 44106 USA
2. Visiting Professor, Department of Neurosciences, King Faisal Specialist Hospital and Research Center; and Neuropathologist, Department of Pathology, The Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, Ohio 44106 USA
3. Chairman, Department of Pathology and Laboratory Medicine, King Faisal Specialist Hospital and Research Centre, Riyadh 11211, Saudi Arabia