Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Infection Control Measures/Investigation of Implicated Re-useable Medical Device: After the first site visit on May 31, 2006, ACDC issued interim recommendations including adding antibiotic coverage from gram-negative organisms for cardiac surgery patients, collecting surveillance cultures (sputum) on all intubated CVICU patients, collecting environmental cultures, and culturing the TEE equipment and removing it from use.
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