1. Department of Otolaryngology,Head & Neck Surgery, Keck School of Medicine of the University of Southern California, Los Angeles, California, USA
2. Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
3. Departments of Otolaryngology,Head & Neck Surgery, Johns Hopkins University, Baltimore, Maryland, USA
4. Center on Aging and Health, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
5. Departments of Geriatric Medicine, Mental Health and Epidemiology, Johns Hopkins University, Baltimore, Maryland, USA
6. Department of Community-Public Health, School of Nursing, Johns Hopkins University, Baltimore, Maryland, USA