1. Department of Otolaryngology-Head and Neck Surgery; Johns Hopkins University; Baltimore Maryland
2. Center on Aging and Health; Johns Hopkins University; Baltimore Maryland
3. Department of Biostatistics; Johns Hopkins University; Baltimore Maryland
4. Geriatric Research; Education and Clinical Center; Veterans Affairs Pittsburgh Healthcare System; Pittsburgh Pennsylvania
5. Department of Communication Science and Disorders; University of Pittsburgh; Pittsburgh Pennsylvania
6. Laboratory of Epidemiology and Population Sciences; National Institute on Aging; Bethesda Maryland
7. Epidemiology Group; School of Medicine and Dentistry; University of Aberdeen; Aberdeen UK
8. Department of Preventive Medicine; Health Science Center; University of Tennessee; Memphis Tennessee
9. Department of Medicine; School of Medicine; University of California at San Francisco; San Francisco California
10. Department of Epidemiology; Graduate School of Public Health; University of Pittsburgh; Pittsburgh Pennsylvania
11. Department of Medicine; School of Medicine; University of Pittsburgh; Pittsburgh Pennsylvania
12. Division of Geriatric Medicine and Gerontology; Department of Medicine; School of Medicine; Johns Hopkins University; Baltimore Maryland
13. Intramural Research Program; National Institute on Aging; Baltimore Maryland
14. Department of Epidemiology; Johns Hopkins University; Baltimore Maryland
15. Department of Mental Health; Bloomberg School of Public Health; Johns Hopkins University; Baltimore Maryland