1. Division of Renal Medicine, Department of Medicine, Emory University Department of Medicine, Atlanta, Georgia
2. Department of Veterans Affairs Health Care System, Decatur, Georgia
3. Center for Visual and Neurocognitive Rehabilitation, Department of Veterans Affairs Health Care System, Decatur, Georgia
4. Departments of Neurology and Rehabilitation Medicine, Emory University Department of Medicine, Atlanta, Georgia
5. Department of Neurology, Emory University Department of Medicine, Atlanta, Georgia