No abstract available
MeSH terms
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Adolescent
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Adult
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Age Factors
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Birth Order
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Child
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Child Development*
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Child, Preschool
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Educational Status
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Environment
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Female
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Genetics, Medical
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Humans
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Infant
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Intelligence Tests*
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Intelligence*
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Male
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Parents
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Personality
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Pregnancy
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Psychometrics
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Sex Factors
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Sibling Relations
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Social Class
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Statistics as Topic
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Triplets
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Twins
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United States