No abstract available
MeSH terms
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Attitude*
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Cannabis
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China / ethnology
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Cross-Cultural Comparison*
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Diphenhydramine
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Humans
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Methaqualone
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Morphine Dependence / epidemiology
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Opium
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Psychotropic Drugs
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Singapore
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Substance-Related Disorders* / epidemiology
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Substance-Related Disorders* / prevention & control
Substances
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Psychotropic Drugs
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Methaqualone
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Opium
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Diphenhydramine