No abstract available
Publication types
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Clinical Trial
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Letter
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Randomized Controlled Trial
MeSH terms
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Adult
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Aged
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Analysis of Variance
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Child, Preschool
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Chronic Disease
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Double-Blind Method
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Dyspnea / drug therapy
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Exercise Test
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Exercise*
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Female
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Heart Failure / drug therapy*
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Heroin / administration & dosage*
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Humans
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Male
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Middle Aged
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Narcotics / administration & dosage*
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Prospective Studies
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Regression Analysis