1. Harvard Center for Population and Development Studies, Harvard University, Cambridge, MA, USA
2. MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, University of the Witwatersrand, Johannesburg, South Africa
3. Taub Institute for Research on Alzheimer’s Disease and the Aging Brain, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
4. Gertrude H. Sergievsky Center, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
5. Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
6. Department of Epidemiology and Biostatistics, University of California, San Francisco, CA, USA
7. Institute for Healthcare Policy and Innovation, University of Michigan, Ann Arbor, MI, USA
8. Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI, USA
9. Institute for Social Research, University of Michigan, Ann Arbor, MI, USA
10. Veterans Affairs Center for Clinical Management Research, Ann Arbor, MI, USA
11. Department of Neurology, New York University Grossman School of Medicine, New York, NY, USA
12. Division of Geriatric Medicine, School of Clinical Medicine, University of the Witwatersrand, Johannesburg, South Africa
13. Department of Social and Behavioral Sciences, Harvard T.H. Chan School of Public Health, Boston, MA, USA