No abstract available
MeSH terms
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Aged
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Humans
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Male
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Oral Ulcer / etiology*
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Positive-Pressure Respiration / adverse effects*
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Pulmonary Disease, Chronic Obstructive / complications
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Pulmonary Disease, Chronic Obstructive / therapy*
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Respiratory Insufficiency / complications
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Respiratory Insufficiency / therapy
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Ulcer