1. Department of Anatomy and Neurobiology, University of Kentucky College of Medicine, Lexington, Kentucky.
2. Sanders-Brown Center on Aging, University of Kentucky College of Medicine, Lexington, Kentucky.
3. BARROW Neurological Institute at Phoenix Children's Hospital; Department of Child Health, University of Arizona College of Medicine, Phoenix, Arizona; Phoenix Veteran Affairs Healthcare System, Phoenix, Arizona; Interdisciplinary Graduate Program in Neuroscience, Arizona State University, Tempe, Arizona.