No abstract available
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Adolescent
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Cocaine*
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Female
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Humans
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Marijuana Smoking / epidemiology*
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Marijuana Smoking / urine
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Patient Compliance*
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Pregnancy
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Substance Abuse Detection
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Substance-Related Disorders / epidemiology*
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Substance-Related Disorders / urine