1. Department of Psychiatry and Behavioral Sciences, The Johns Hopkins University School of Medicine , Baltimore, Maryland , USA
2. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health , Baltimore, Maryland , USA
3. Cochlear Center for Hearing and Public Health, Johns Hopkins Bloomberg School of Public Health , Baltimore, Maryland , USA
4. Department of Psychiatry, University of Connecticut Health Center , Farmington, Connecticut , USA
5. Department of Psychiatry and Behavioral Sciences, University of California, San Francisco , San Francisco, California , USA
6. San Francisco VA Medical Center , San Francisco, California , USA
7. Laboratory of Behavioral Neuroscience, Intramural Research Program, National Institute on Aging , Baltimore, Maryland , USA
8. Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health , Baltimore, Maryland , USA
9. Department of Epidemiology and Biostatistics, Michigan State University , East Lansing, Michigan , USA
10. Department of Epidemiology and Biostatistics, University of California, San Francisco , San Francisco, California , USA
11. Kaiser Permanente Center for Health Research , Portland, Oregon , USA
12. Department of Neurology, University of California, San Francisco , San Francisco, California , USA
13. Longitudinal Studies Section, Intramural Research Program, National Institute on Aging , Baltimore, Maryland , USA