No abstract available
Publication types
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Clinical Trial
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Comparative Study
MeSH terms
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Antitussive Agents / pharmacology*
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Antitussive Agents / therapeutic use*
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Clinical Trials as Topic
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Codeine / therapeutic use
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Cough / drug therapy*
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Humans
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Placebos
Substances
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Antitussive Agents
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Placebos
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Codeine