1. Department of Medicine, Division of Geriatrics, University of Utah, Salt Lake City, Utah;
2. Geriatric Research, Education, and Clinical Center, George E. Whalen VA Medical Center, Salt Lake City, Utah;
3. Department of Neurological, Neuropsychological, Morphological and Movement Sciences, University of Verona, Verona, Italy;
4. Department of Radiology and Utah Center for Advanced Imaging Research, University of Utah, Salt Lake City, Utah;
5. Department of Exercise and Sport Science, University of Utah, Salt Lake City, Utah