The economic burden of chronic obstructive pulmonary disease (COPD) in a U.S. Medicare population

A new method of classifying prognostic comorbidity in longitudinal studies: Development and validation

Mary E. Charlson, Peter Pompei, Kathy L. Aleš et al. · Journal of Chronic Diseases · 1987 · 48.8K citations

Prognostic Assessment, Longitudinal Studies, Prognostic Comorbidity +11

Adapting a clinical comorbidity index for use with ICD-9-CM administrative databases

Richard A. Deyo · Journal of Clinical Epidemiology · 1992 · 10.4K citations

Primary Care, Psychiatry, Health Policy +13

The costs of exacerbations in chronic obstructive pulmonary disease (COPD)

Fredrik Andersson, Sixten Borg, Sven‐Arne Jansson et al. · Respiratory Medicine · 2002 · 296 citations · Full text

Health Policy, Health Economics, Advanced Lung Disease +3

The Costs of Treating COPD in the United States

Scott A. Strassels, David H. Smith, Sean D. Sullivan et al. · CHEST Journal · 2001 · 287 citations

Pulmonary Care, Health Policy, Health Economics +6

Economic analysis of the confronting COPD survey: an overview of results

Emiel F.�M. Wouters · Respiratory Medicine · 2003 · 252 citations · Full text

Economics, Pulmonary Care, Health Economics +7