No abstract available
MeSH terms
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Adult
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Fluorides*
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Helium*
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Humans
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Male
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Middle Aged
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Models, Biological*
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Pulmonary Ventilation
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Respiration*
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Respiratory Dead Space
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Respiratory Function Tests
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Sulfur Hexafluoride*
Substances
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Helium
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Fluorides
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Sulfur Hexafluoride