1. Department of Preventive Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
2. Caregiver Center, Veterans Affairs Medical Center, Memphis, TN, USA
3. Department of Neurology, University of Tennessee Health Science Center, Memphis, TN, USA
4. Department of Anatomy & Cell Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
5. Office of the Saskatchewan Multiple Sclerosis Research Chair, Division of Neurology, Department of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
6. Geriatric Group of Memphis, Memphis, TN, USA
7. Departments of Preventive and Internal Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
8. Caregiver Center, Veterans Affairs Medical Center, Departments of Preventive and Internal Medicine, University of Tennessee Health Science Center, Memphis, TN, USA