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*Department of Otolaryngology-Head and Neck Surgery, The Johns Hopkins University
School of Medicine, Baltimore, Maryland, U.S.A.; †Department of Ophthalmology, The
Wilmer Eye Institute, The Johns Hopkins University School of Medicine, Baltimore,
Maryland, U.S.A.; ‡Department of Kinesiology, University of Maryland, College Park,
Maryland, U.S.A.; and §Longitudinal Studies Section, National Institute on Aging,
Baltimore, Maryland, U.S.A.