All of the patients ' plasma blood urea nitrogen ( BUN ) and creatinine levels were measured on the second and seventh day after the administration of intravenous contrast material .
O O O B-OrganismTaxon O O B-ChemicalEntity I-ChemicalEntity I-ChemicalEntity O B-ChemicalEntity O O B-ChemicalEntity O O O O O O O O O O O O O O B-ChemicalEntity O O