No abstract available
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Aged
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Aged, 80 and over
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Aging / physiology*
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Cohort Studies
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Health Status*
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Humans
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Interpersonal Relations*
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Japan
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Longevity
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Longitudinal Studies
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Mental Health
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Sex Distribution
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Sleep
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Socioeconomic Factors