1. Department of Health and Human Physiology, University of Iowa, Iowa City, Iowa
2. Department of Kinesiology, North Central College, Naperville, Illinois
3. Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado
4. Eastern Colorado VA Geriatric, Research, Education, and Clinical Center (GRECC), Aurora, Colorado
5. Abboud Cardiovascular Research Center, University of Iowa, Iowa City, Iowa
6. Department of Medicine, National Jewish Health, Denver, Colorado
7. Department of Psychiatry, University of Colorado Anschutz Medical Campus, Aurora, Colorado
8. Department of Psychiatry, University of Iowa, Iowa City, Iowa
9. Iowa Neuroscience Institute, University of Iowa, Iowa City, Iowa