1. Department of Psychiatry, University of Pennsylvania, Philadelphia, Pennsylvania, USA
2. Department of Geriatric Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
3. Department of Neurology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
4. Department of Nursing, Wisconsin University, Madison, Wisconsin, USA
5. Department of Psychiatry, Rush University Medical Center, Chicago, Illinois, USA
6. Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, Illinois, USA
7. Department of Neurology, Washington University in St. Louis, St. Louis, Missouri, USA
8. Department of Psychology, University of Johannesburg, Johannesburg, South Africa
9. Department of Public Health, Washington University in St. Louis, St. Louis, Missouri, USA
10. Department of Family Medicine and Behavioral Health, University of Minnesota Medical School, Minneapolis, Minnesota, USA
11. Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois, USA