No abstract available
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adolescent
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Adult
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Child
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Child Development*
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Child, Preschool
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Cohort Studies
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Female
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Health Behavior
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Health Surveys
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Humans
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Infant
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Infant, Newborn
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Male
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Middle Aged
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Population Surveillance / methods*
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Social Class
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United Kingdom