JNCI Journal of the National Cancer Institute · 2011 · 280 citations · 48 references
In a US population of older breast cancer patients, 13 individual comorbid conditions were associated with decreased overall survival and increased mortality.
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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