No abstract available
MeSH terms
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Bias
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Data Interpretation, Statistical
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Humans
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Lung / physiopathology*
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Placebos
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Pulmonary Disease, Chronic Obstructive / physiopathology*
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Pulmonary Disease, Chronic Obstructive / therapy
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Pulmonary Medicine / methods
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Pulmonary Medicine / standards
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Randomized Controlled Trials as Topic
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Regression Analysis
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Research Design
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Time Factors
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Treatment Outcome