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Incidence and Cost of Pneumonia in Older Adults with COPD in the United States
- Marian Ryan,
- Jose A. Suaya,
- John D. Chapman,
- William B. Stason,
- Donald S. Shepard,
- Cindy Parks Thomas
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- Published: October 9, 2013
- https://doi.org/10.1371/journal.pone.0075887