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