Annals of the American Thoracic Society · 2013 · 63 citations · 32 references
Chronic pain and opioid use are prevalent among adults with COPD. This finding was not explained by the burden of comorbidity.
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Comorbidity Measures for Use with Administrative Data
Anne Elixhauser, Claudia Steiner, D.R. Harris et al. · Medical Care · 1998 · 9.6K citations