1. Department of Health and Human Physiology, University of Iowa, Iowa City, Iowa, United States
2. Department of Anesthesiology, University of Kansas Medical Center, Kansas City, Kansas, United States
3. Department of Medicine, Division of Geriatric Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, United States
4. Department of Kinesiology, North Central College, Naperville, Illinois, United States
5. School of Kinesiology, University of Michigan, Ann Arbor, Michigan, United States
6. Department of Medicine, Perelman School of Medicine, University of Pennsylvania and Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, United States
7. Department of Psychological and Brain Sciences, University of Iowa, Iowa City, Iowa, United States
8. Department of Internal Medicine, University of Iowa, Iowa City, Iowa, United States