Quality improvement, case mix, and preventive procedures: when should the playing field be leveled for carotid endarterectomy?
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D015897:Comorbidity; D003627:Data Interpretation, Statistical; D003953:Diagnosis-Related Groups; D016894:Endarterectomy, Carotid / Q000592:standards / Q000706:statistics & numerical data; D006801:Humans; D017063:Outcome Assessment, Health Care; D011314:Preventive Health Services / Q000706:statistics & numerical data; D014481:United States