No abstract available
Publication types
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Clinical Trial
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Controlled Clinical Trial
MeSH terms
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Aged
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Asthma / drug therapy*
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Bronchitis / drug therapy*
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Clinical Trials as Topic
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Ephedrine / therapeutic use*
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Humans
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Isoproterenol / therapeutic use*
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Middle Aged
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Theophylline / therapeutic use*
Substances
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Theophylline
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Ephedrine
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Isoproterenol