No abstract available
Publication types
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Letter
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Adolescent
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Chi-Square Distribution
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Child
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Child, Preschool
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Cotinine / urine*
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Female
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Humans
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Male
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Surveys and Questionnaires
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Tobacco Smoke Pollution / adverse effects*
Substances
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Tobacco Smoke Pollution
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Cotinine