No abstract available
MeSH terms
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Age Factors
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Child
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Child Development*
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Child Rearing
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Child, Preschool
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Cross-Cultural Comparison*
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Female
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Humans
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Infant
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Infant, Newborn
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Language Development
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Male
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Motor Skills
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Psychological Tests*
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Psychometrics
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Social Behavior
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Social Class
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Tokyo
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United States
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Urban Population