1. Department of Anatomy and Neurobiology, Chandler Medical Center, University of Kentucky, Lexington, KY, USA
2. Sanders-Brown Center on Aging, Alzheimer's Disease Center, Chandler Medical Center, University of Kentucky, Lexington, KY, USA
3. Magnetic Resonance Imaging and Spectroscopy Center, Chandler Medical Center, University of Kentucky, Lexington, KY, USA
4. Department of Behavioral Sciences, Chandler Medical Center, University of Kentucky, Lexington, KY, USA
5. Neurology, Chandler Medical Center, University of Kentucky, Lexington, KY, USA