No abstract available
MeSH terms
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Adult
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Aged
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Dyspnea / drug therapy*
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Humans
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Middle Aged
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Nicotinic Acids / therapeutic use*
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Pulmonary Heart Disease / drug therapy*
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Respiratory Insufficiency / drug therapy*
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Theophylline / therapeutic use*
Substances
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Nicotinic Acids
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Theophylline