A modified Elixhauser score for predicting in-hospital mortality in internal medicine admissions

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Coding Algorithms for Defining Comorbidities in ICD-9-CM and ICD-10 Administrative Data

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Epidemiology of multimorbidity and implications for health care, research, and medical education: a cross-sectional study

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Prevalence, Expenditures, and Complications of Multiple Chronic Conditions in the Elderly

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