No abstract available
Publication types
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Research Support, N.I.H., Intramural
MeSH terms
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Aged
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Aged, 80 and over
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Arthritis, Rheumatoid / complications*
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Female
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Hospitalization / trends*
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Humans
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Male
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Middle Aged
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Pneumocystis carinii*
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Pneumonia, Pneumocystis / epidemiology*
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Prevalence
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Retrospective Studies
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United States / epidemiology