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:The results obtained in our study agree with previous clinical observations that have failed to detect a link between administration of exogenous glutamate and clinical neurological injury in association with cardiac surgery.(11,12) The results also argue against a role for exogenous glutamate in the evolution of subclinical neurological injury.
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