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A comparison of the Charlson comorbidity index derived from medical record data and administrative billing data.
J Clin Epidemiol. 1999 Feb;52(2):137-42. doi: 10.1016/s0895-4356(98)00154-1.
J Clin Epidemiol. 1999.
PMID: 10201654
Carotid endarterectomy among Medicare beneficiaries: a statewide evaluation of appropriateness and outcome.
Karp HR, Flanders WD, Shipp CC, Taylor B, Martin D.
Karp HR, et al.
Stroke. 1998 Jan;29(1):46-52. doi: 10.1161/01.str.29.1.46.
Stroke. 1998.
PMID: 9445327
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