1. Department of Neurology, University of Kentucky, Lexington, Kentucky, USA
2. Department of Internal Medicine, University of Medical Sciences, Ondo City, Ondo State, Nigeria
3. Department of Internal Medicine, University of Benin, Benin City, Edo State, Nigeria
4. Neurology Department, Neuroscience Directorate, Royal Stoke University Hospital, University Hospital of North Midlands NHS Trust, Stoke on Trent, UK