Respiratory Medicine · 2009 · 68 citations · 29 references
MedicineClinical SciencesInternal MedicinePulmonologyAcute Exacerbation ManagementChronic Obstructive Pulmonary DiseaseChronic Obstructive Pulmonary Disease CareObstructive Lung DiseaseRespiratory DiseaseChronic Disease ExacerbationChronic Obstructive Pulmonary Disease EpidemiologyExacerbation Risk StratificationExacerbation Severity AssessmentPulmonary Exacerbations
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Validation of a combined comorbidity index
Mary E. Charlson, Ted P. Szatrowski, Janey C. Peterson et al. · Journal of Clinical Epidemiology · 1994 · 6.6K citations