title: The need for validation studies of comorbidity adjustment instruments.
authors.forename: Lung-I
authors.initials: LI
authors.lastname: Cheng
authors.forename: Abiola
authors.initials: A
authors.lastname: Oladapo
authors.forename: Karen L
authors.initials: KL
authors.lastname: Rascati
mesh_terms: D015897:Comorbidity; D015340:Epidemiologic Research Design; D006305:Health Status Indicators; D006801:Humans; D015233:Models, Statistical; D012107:Research Design; D020379:Risk Adjustment; D012720:Severity of Illness Index; D054928:Validation Studies as Topic