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