No abstract available
Publication types
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Clinical Trial
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Comparative Study
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Controlled Clinical Trial
MeSH terms
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Aged
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Antitussive Agents / therapeutic use*
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Bronchitis / complications
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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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Evaluation Studies as Topic
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Humans
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Male
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Middle Aged
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Placebos
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Pulmonary Emphysema / complications
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Tape Recording
Substances
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Antitussive Agents
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Placebos
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Codeine